v3.2.1: Small adjustments for new aapt-branch.

v3.2.0: Checks if installation directory exists before running the sc…

…ript

Added AAPT-bin (only in aapt-branch)

closes simmac#3

Fixed small readme error after updating to platform-tools v23 rc_2

VERSION 3.0:

 - Major code cleanup (using functions now)
 - Added uninstaller option (use *uninstall* as the first argument)
 - Added possibility to install either adb or fastboot seperately (use *adb* or *fastboot* as the first argument)
 - Changed OS X install path from /usr/bin to /usr/local/bin (Please run *./install uninstall-old* first if you used this script with version < 3.0! This will remove the old bins from /usr/bin.)
 - Added copy of the Apache License 2.0 as required

Merge branch 'master' into preview

This branch uses previews of adb/fastboot!

Updated to v23 rc_1 of the platform-tools.

Updated README

Signed-off-by: SimMac <->

Improved version check by adding a hash-check to compare installed an…

…d delivered bin.

Version 1.2: Updated binaries to newest version from the platform-too…

…ls v22.

Added additional dialogue because I realized, that some binary updates will not increase the version number.

PLEASE NOTE: I dropped the installer package support, see README for details.