Added app cache (offline) support.

- Now, application should work even in case the internet connection has been lost
- Should solve font files getting downloaded on page refresh. They will be now cached till manifest.appcache is not changed.
jQuery no more fethched CDN. Added on appcache.
manifest.appcache changed
Added icon images for iOS and Android.
Enabled Web Application support for iOS.

See, https://github.com/samyakbhuta/chhapkaam/issues/18
bumping manifest.appcache
Minor: File name correction
Added iOS splashscreens for all resolutions.
Minor: Added sizes attribute for 57x75.
Trivial: Added extra comments.
Merge branch 'gh-pages'
Merge branch 'master' of github.com:samyakbhuta/chhapkaam