* Fixes an issue when evaluating expression with empty
* Fixes a fatal error on PHP 5.3
* Displays other notices
* Updates stable tag
* Adds some escaping and sanitizing
* Defines plugins dir for different environments
* Adds tests for activation and deactivation hooks
* Adds a debugging function for tests
* Symlinks plugin into tests dir
* Splits out deactivation code into separate functions
* Fixes activation and deactivation hooks not being fired
* Exclude backups folder from size calculation
* Fixes a misplaced parenthesis
* Fixes how error messages are bubbled up
* get home path should return defined value
* Removes redundant exclude statement as CVS folders are excluded by default
* Adds a flag parameter to allow get_files to return all files including default excludes
