Build tests failing (#8)

* General file clean-up, removed PhpStorm files, also removed Coveralls.
* Fixes around bumping minimum PHP version to 7.2 (to match Monolog).
* Removed nightly PHP builds as not fully supported it at this time.

.devcontainer/Dockerfile

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+#-------------------------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
+#-------------------------------------------------------------------------------------------------------------
+
+FROM php:7.2-cli
+
+# Avoid warnings by switching to noninteractive
+ENV DEBIAN_FRONTEND=noninteractive
+
+# This Dockerfile adds a non-root user with sudo access. Use the "remoteUser"
+# property in devcontainer.json to use it. On Linux, the container user's GID/UIDs
+# will be updated to match your local UID/GID (when using the dockerFile property).
+# See https://aka.ms/vscode-remote/containers/non-root-user for details.
+ARG USERNAME=vscode
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+# Configure apt and install packages
+RUN apt-get update \
+    && apt-get -y install --no-install-recommends apt-utils dialog 2>&1 \
+    #
+    # install git iproute2, procps, lsb-release (useful for CLI installs)
+    && apt-get -y install git iproute2 procps iproute2 lsb-release \
+    && apt-get -y install zip \
+    #
+    # Install xdebug
+    && yes | pecl install xdebug \
+    && echo "zend_extension=$(find /usr/local/lib/php/extensions/ -name xdebug.so)" > /usr/local/etc/php/conf.d/xdebug.ini \
+    && echo "xdebug.remote_enable=on" >> /usr/local/etc/php/conf.d/xdebug.ini \
+    && echo "xdebug.remote_autostart=on" >> /usr/local/etc/php/conf.d/xdebug.ini \
+    #
+    # Create a non-root user to use if preferred - see https://aka.ms/vscode-remote/containers/non-root-user.
+    && groupadd --gid $USER_GID $USERNAME \
+    && useradd -s /bin/bash --uid $USER_UID --gid $USER_GID -m $USERNAME \
+    # [Optional] Add sudo support for the non-root user
+    && apt-get install -y sudo \
+    && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME\
+    && chmod 0440 /etc/sudoers.d/$USERNAME \
+    #
+    # Clean up
+    && apt-get autoremove -y \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
+
+# Switch back to dialog for any ad-hoc use of apt-get
+ENV DEBIAN_FRONTEND=dialog
+
+# Install Composer
+RUN curl -sS https://getcomposer.org/installer | php && mv composer.phar /usr/local/bin/composer

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/vscode-remote/devcontainer.json or the definition README at
+// https://github.com/microsoft/vscode-dev-containers/tree/master/containers/php-7
+{
+	"name": "Monolog-WP-CLI",
+	"dockerFile": "Dockerfile",
+	// Use 'settings' to set *default* container specific settings.json values on container create. 
+	// You can edit these settings after create using File > Preferences > Settings > Remote.
+	"settings": { 
+		"terminal.integrated.shell.linux": "/bin/bash"
+	},
+
+	// Use 'appPort' to create a container with published ports. If the port isn't working, be sure
+	// your server accepts connections from all interfaces (0.0.0.0 or '*'), not just localhost.
+	// "appPort": [],
+
+	// Uncomment the next line to run commands after the container is created.
+	// "postCreateCommand": "php -v",
+
+	// Uncomment the next line to have VS Code connect as an existing non-root user in the container. 
+	// On Linux, by default, the container user's UID/GID will be updated to match your local user. See
+	// https://aka.ms/vscode-remote/containers/non-root for details on adding a non-root user if none exist.
+	"remoteUser": "vscode",
+
+	// Add the IDs of extensions you want installed when the container is created in the array below.
+	"extensions": [
+		"felixfbecker.php-debug",
+		"felixfbecker.php-intellisense"
+	]
+}