Update gitignore

See https://github.com/bcit-ci/CodeIgniter/blob/3.1-stable/.gitignore

.gitignore

@@ -1,13 +1,27 @@
-nbproject
-._*
-.~lock.*
-.buildpath
 .DS_Store
-.idea
-.project
-.settings
-cache.properties
-build
-vendor/
-composer.phar
-application/logs/
+
+application/cache/*
+!application/cache/index.html
+!application/cache/.htaccess
+
+application/logs/*
+!application/logs/index.html
+!application/logs/.htaccess
+
+user_guide_src/build/*
+user_guide_src/cilexer/build/*
+user_guide_src/cilexer/dist/*
+user_guide_src/cilexer/pycilexer.egg-info/*
+/vendor/
+
+# IDE Files
+#-------------------------
+/nbproject/
+.idea/*
+
+## Sublime Text cache files
+*.tmlanguage.cache
+*.tmPreferences.cache
+*.stTheme.cache
+*.sublime-workspace
+*.sublime-project