Delete unecessary layouts, rename some

- Delete unused xml layout files
- Rename the fragment layout files appropriately
Add all needed icons / delete or change old ones

Add all of the needed icons for the app in all of the densities. The ones
that were before are either modified or deleted.
Add the balance icon and modify the balance view
Implement tab icons

- Add icons to the tab along with text
- Change the old bar chart icon for a new - neater one
Implement new balance info design

- Center the balance info view.
- The explanation now pops-up just by clicking on the balance, instead of
  having an icon next to it. This makes the UI less cluttery.
- Set an onClickListener to the overdraft warning icon.
- Bring over the StartRecountDailyBudget prompt from the previous
  mainActivity to the ProgressFragment.
- Add a new, shorter, balance explanation.
Implement the new design for the Progress Bar

Wanted to make a padding of a different color for the progress bar, but
for right I decided to stick with the same color for the padding, because
when the value bar gets too small - it goes over the bacgkround since
everything has 20 dp corners - and it messes up everything. Will fix this
in later versions.

- Make the text larger within the progress bar.
- Make the progress bar corners round by adding drawables and setting them
  as a background for the value bar and the progress bar itself.
- Add padding to the progress bar.
- Make appropriate changes to the layout to center everything.
- Connect the monthly budget overdraft button with the onClickListener
  that calls the raiseMonthlyBudgetDialog.
Implement new Add Expense button design

- Add an icon for the add expense button
- Make the add expense button respond to user clicks by implementing a
  selector that makes the button change a color to a darker one.
- Apply the new design to both fragments.
Implement alternative layouts for xhdpi and hdpi

For some reason the views don't scale properly for xhdpi and hdpi screen
resolutions and therefore I needed to provide alternative layouts for
these types of densities. Also decided not to mess with landscape layout
for now.

- Provide "supports screens" attribute to the Manifest file.
- Add the screenOrientation attribute to the manifest, so that the app
  only displays in portrait mode for now.
- Provide alternative layouts for xhdpi and hdpi portrait mode.
- Modify progress fragment layout files, so that they would look nice and
neat in all densities.
changed the background color for the progress fragment