Added initial distribution of polysquare-generic-file-linter.

Checks for
 1. Copyright header at end of header block
 2. Relative path to file at beginning of header block
 3. Space between #2 and description
 4. Files end with /n
Merge pull request #1 from smspillaz/polysquare-generic-file-linter.item_1

Added initial distribution of polysquare-generic-file-linter.