Tiramisu Update

• Dropped support for Froyo through Honeycomb; increased the minimum supported version to Ice Cream Sandwich.
• Bumped the target version from Snow Cone to Tiramisu.
• Fixed a minor UI issue where the soft keyboard was covering up the bottom of a note and the Done and Details buttons in the editor.
• Refactored the app to use an internal repository class instead of having a Provider. This enables automated testing for certain layers of code on emulators.