Support copy

[KentVu]

Yes copying is nice :), just by one click on the character is ok? A popup menu should be good, may this be merge with #4 ?

[KentVu]

• [x] At first be able to copy the character on clicking it -> http://stackoverflow.com/questions/15529806/how-to-highlite-word-which-is-click-in-textview-android
• [x] Show the character to input text field
• [x] Add option item to allow directly copy character on click: http://developer.android.com/guide/topics/ui/dialogs.html

Knowledge base

• http://developer.android.com/guide/topics/text/copy-paste.html