added overwrite flag to linkFile

When deploying to iOS, the build fails on ln if the project has been built once before because ln will not overwrite the symbolic links to assets
Passing true to proposed overwrite flag

Fixes ln failing building on iOS
see: http://www.openfl.org/developer/forums/bugs/file-exists/
Cleanup build
Merge pull request #20 from haxiomic/patch-1

added overwrite flag to linkFile
Merge pull request #21 from haxiomic/patch-2

Passing true to proposed overwrite flag
Minor path and 'create extension' fixes
Handle <dependency name='path/to/libExample.a' /> for iOS, allows nicer linking to pre-existing iOS libraries that are frameworks
Support --dependency command-line flag, link libc++ on iOS and update ios-sim version for iOS 7
Add longer timeout for ios-sim
Invalid path fix, switch back to g++ by default on iOS builds
Update to 1.0.7
Already used 1.0.7, update to 1.0.8
added android simulator
Merge branch 'android_simulator'