fix crash on restore list of entries
changed targer version of the application, since the newest android version available si 18
fixed exiting app when back button is pressed while in "Tap to open file"
updated gradle files to use gradle 1.8 and gradle-plugin 0.6.+ (for android studio 0.3.0)
Merge pull request #3 from sviro/fix/targetVersion

changed targer version of the application
Merge pull request #5 from sviro/feature/updateGradle

updated gradle files to use gradle 1.8 and gradle-plugin 0.6.+
Merge pull request #4 from sviro/fix/backButton

fixed exiting app