Merge pull request #108 from xLaMbChOpSx/master

Various Commits
Update CHANGELOG.md
Improved introduction
Merge pull request #109 from andr3jx/master

Improved Introduction
Improved introduction
Put "GPS Required" into round brackets
Merge pull request #110 from andr3jx/master

Removed sentence about security protocol AKA
AT Command Injection v2 & RootTools

Totally re-wrote the AT Command Injection system using the RootTools library
which has helped simplify the system, this change should hopefully bring back
the same (if not better) level of functionality experienced with earlier alpha
releases.

Unable to test AT Commands on either of my devices but shell commands return expected results, so hopefully once tested AT Command execution can be
confirmed.

RootTools v3.5 - https://github.com/Stericson/RootTools
Added to project under libs directory, gradle build config updated but you may
need to check your IDE to confirm it is including RootTools.jar if you face
any problems.
Revert Notification Behaviour

Reverted notification behaviour so the idle (grey) icon is shown whilst the
app is running but not actively engaged in any task, normal (green) will
display when tracking or monitoring cell details and warning and alarm icons
will be displayed when triggered by changed LAC, femtocell detection etc.