Corrected JSHint errors and fixed code alignment

[MichaelF2]

This is the version we are using in our Angular app. Made some minor changes such as triple equality checks, removed duplicate var definitions, etc. The bottom half of the code had misaligned spacing, so this was corrected as well. The diff is somewhat difficult to read in the online editor. The changes are more obvious in WinMerge.

[MichaelF2]

Full list of modifications in pull request:

Removed unused variables: isDefined, forEach
Fixed duplicate variable defintions: areSimilar, differences, eq, returnEq, tooSim
Added missing semicolon after returnEq assignment
Added hasOwnProperty checks to "for ... in" loops
Fixed scoping issues for variables: areSimilar, differences, parsedUnequalVariable, tooSim
Changed all equality checks from == to ===
Changed all inequality checks from != to !==
Fixed whitespace issues