[Removed] MainActivity.java. Its functionallity will be moved
to ListDevices.java
[Modified] ListDevices.java to insert the logic from MainActivity.java
[Modified] ListDevices.java to clean the code
[Modified] AndroidManifest.xml to set ListDevices as launcher activity
[Modified] Strings.xml to change ListDevices title, this way Ardusonar
appears on the launcher and not ListDevices
[Added] Constants.java, a file to store all the constant values used
in the project code
[Modified] TransmissionActivity.java and ListDevices.java to use
Constants.java
[Modified] ListDevices now shows always an update devices list
[Modified] CannotEnableBTAlert texts
[Modified] Strngs.xml to add new CannotEnableBTAlert texts
[Modified] ListDevices, now saying "no" to enabling BT works.
But showing the devices list is broken again.
[Modified] Now theoretically the list shows up correctly, but pressing
"no" in blutooth activation request ends up in an infinite interaction
loop
Merge branch 'master' of https://Inversebit@github.com/Inversebit/ardusonar.git into GUI-Improvements
[Modified] Now the devices are always shown correctly

This commit closes #2 and #3
[Modified] Changed app theme
[Modified] Restored full functionality to ListDevices.java