remove event listeners from flash AudioElement

should prevent double progress events firing from AudioElements that
have setSrc + load called twice.

refs #338
send `this` to dispatchEvent callbacks

as requested in #434
Update mep-feature-ads.js

view adsLayer only when the AdUrl is not empty, to have normal Play/Pause behaviour
Add repository field to package.json to avoid warn
Keep header comments in the minified files
Keep same order in src loader from Grunt & Builder

This just makes it easier to compare both outputs.
Fix IE8 error on window resizing
Add grunt task to build `flashmediaelement.swf`
Add task to build the CDN version of flash file
Add grunt task to clean the `local-build` folder
Remove older version of the build scripts
Add task to remove console.log (see #1147 & #1243)

Added a new Grunt task to the build process to remove `console.log`
statements. This is important for production since, in some versions
of IE, the `console` object is only created after opening the
Developer Tools.
i18n : add spanish, italian, japanese, korean and portuguese translations

Adding new translation in spanish, italian, japanese, korean and
portuguese, for all strings from mediaelement-and-player.js
i18n : update german, simplified and traditionnal chinese translation

Update translations in german, simplified and traditionnal chinese , for
all strings from mediaelement-and-player.js
Merge pull request #1294 from johndyer/338-double-progress-from-flash-after-setsrc

remove event listeners from flash AudioElement
Merge pull request #1296 from schrolli/master

mep-feature-ads: Link overlay only when url is given
Merge pull request #1300 from dmfrancisco/npm-repo-field

Add repository field to package.json to avoid warning
Merge pull request #1301 from chemerisuk/master

Fix IE8 error on window resizing
Merge pull request #1295 from johndyer/dispatch-event-with-this

send `this` to dispatchEvent callbacks
Merge pull request #1303 from SuriyaaKudoIsc/master

Update README.md