Added pauseAutoPlay/resumeAutoPlay methods to control slideshow, fix #25
Delay property now uses milliseconds internally
Added documentation for pauseAutoPlay/resumeAutoPlay methods
Added tests for autoPlay on pauseAutoPlay method
Added support to visibilitychange events, fixes #23
Fixed problem with resuming autoPlay time, had to switch slideshow interval to use setTimeout instead
Added some useful comments
Added support to Page visibility API as a feature on README file
Added constructor to doc file
Change slideshow for autoPlay on README file
Better wording on visibility api README
Prioritize page visibility api support on README file
Updated release script
Better constructor doc
Better pause/resume doc
Separated unit and functional tests into different files
Added tests for concat and minified files before release
Fixed randomly failing test
Release v0.4.0
 Merge into master