Flag direct database queries, check for caching functions
Closes #69

Add warning for wpdb calls where caching functions are used within same scope
Add error for wpdb calls if no caching functions are present
Explain outcome of unit test lines
Remove extra lines
Fix the check for caching functions
Add check for database schema changes. Closes #70
Fix multiple notices for same message/same line.
Fix php short tag causing Travis to fail.
Add unit test for failure to use wp_cache_set
Correct wp_cache_set failure unit test
Improve locating scope open/close for functions
Fix regex check for ALTER|CREATE|DROP db calls
Limit whitelisting to usage of wpdb, not including missing cache
Some syntax tweaks, and tweaks on unit test to cascade changes
Merge pull request #96 from WordPress-Coding-Standards/issue/69

Flag direct database queries and database schema changes