Expose isSeeking method.
Merge branch 'hotfix/0.4.6'
Merge tag '0.4.6' into develop

0.4.6

Conflicts:
	bower.json
	dist/flash-playback.js
	dist/flash-playback.min.js
	dist/html5-playback.js
	dist/html5-playback.min.js
	dist/mtvn-playback.js
	dist/mtvn-playback.min.js
	package.json