Fix 5 Maintainability, 3 Complexity issues in multiple files

[codefactor-io]

CodeFactor found multiple issues:

Shadowing of global property 'undefined'.

• js\jquery.gridrotator.js:11
  Commit 63a14f6

'i' is defined but never used.

• js\jquery.gridrotator.js:313
  Commit 63a14f6

'self' is assigned a value but never used.

• js\jquery.gridrotator.js:102
  Commit 63a14f6

Complex Code

• js\jquery.gridrotator.js
  Commit 63a14f6

Complex Method

• js\jquery.gridrotator.js:495-633
  Commit 63a14f6
• js\jquery.gridrotator.js:298-312
  Commit 63a14f6

Unexpected duplicate "margin" (declaration-block-no-duplicate-properties)

• css\demo.css:64
  Commit 985e7cb

Unexpected duplicate selector ".ri-grid ul", first used at line 7 (no-duplicate-selectors)

• css\style.css:27
  Commit 985e7cb