picturePolyfill rewritten with module pattern

picturePolyfill rewritten with module pattern to have its main
functions exposed and testable
Added more tests, script was adapted
Added tests for the _getSrcsetHash function, and made it stronger
Added more tests, made code stronger
Completed tests, refactored some method names
Merge branch 'version-3'
Some refactoring

Did some refactoring, some test still fails on IE9
Added test/index.html to test on VirtualBox's IE
Added trim capability for IE8 + small refactoring
Fixed .trim problem in IE8 tests (jumps tests on IE8)
Merge branch 'master' into version-3
Revert 4a89ca2..bbbdad1

This rolls back to commit 4a89ca286a919096562899a66d55a616ae098484.
IE<9 bug fixed, tests now pass on IE7 and 8
Small format change
Deletet "version1" folder
Version 3 has now full test coverage!!!
Refactoring: exported more functions to be tested
Refactored tests + added some more
Code on a diet: stripped out some characters

Result is now -0.24kb pre gzip
_pr to _pxRatio