Fix for #266

-Extra: Added the appropriate images to drawable folder from Android SDK
source, can be used as alternative if required.
Removed Thumbs.db,added to gitignore
Final fix for #266

-Fix implemented using setIcon() as setIconAttribute() is not valid for
API less than 11
Merge pull request #303 from hav3n/branch-fix-icon

Fix for #266
Partial fix for #304
Added the AsyncTaskResultWrapper
Reworked ImportKeysListFragment to handel exceptions, ImportKeyListLoader is temporarily disabled
Adapted the ImportKeysLoader to work with the new AsyncWrapper
Complete fix for #304
Added documentation to the AsyncTaskResultWrapper
Added StackOverflow link to documentation
Show link to Market if no openpgp provider installed installed
Issue #295
Change resource name and remove unneeded if from 44232af
Merge pull request #308 from mar-v-in/issue-295

Show link to Market if no openpgp provider installed installed
Added GPL headers
Merge pull request #305 from hav3n/branch-dialog-fragment

Partial fix for #304
remove dublication of api library, let both proejcts depend on the same
cleanup
Fix binding of install intents to package
Added error strings for key import from keyserver