Adding fixing capabilities to 3 sniffs

**Bounty related work. 1 of 3 sniffs (ScopeIndent) was done by @westonruter, but he don't want any bounty for that (see https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/issues/247#issuecomment-58917089)**

What was done:

1. added `.fixed` files where it's clearly visible what fixes these sniffs can perform
2. added TODO statements to sniff code to indicate some edge cases, that aren't reported in the sniff itself and thus can't be fixed
3. code changed to comply to PHPCS coding standard
4. for `WhiteSpace.ConstrolStructureSpacing` sniff fixture file updated to trigger all 8 reported errors (before it only triggered 2 of 8)

Closes #247