ota_from_target_files: remove duplicate setting of recovery_img

This variable is already set earlier in the script and does not need
to be wrapped inside of the if statement

Change-Id: I91b7f7d2fc911a3910b3df09cff0ca0f44fe7741
releasetools: Fix error text in ota_from_target_files

property isn't the variable name, prop is

Change-Id: I0fc6adddfd51ba9bc79f6559c61cd831203c9e3d
img_from_target_files: Create md5 hashes for each file

Generate an md5sum-fastboot.md5 file that contains an md5 hash of each
file in the fastboot zip and store the file in the zip.

Change-Id: I19c2ac5a84fb21e965953d1dad0ebcbfd0b78d47
releasetools: Properly handle custom values for tools

Rather than writing these values to their own files, store them
in the target_files META/misc_info.txt. This way, we don't need to
download and parse through multiple files when using signing/release
tools.

Change-Id: I6f845fc055e4ef2ed4adf9628cca505e99b2a9fa
build: Disable Tamil locale

With only 3% approved in CM project and 1% on AOSP project
in the past 5 months, this is a no-go

Change-Id: I0c9d31d5737a2191e9a425b9de98ca659071ad7d
ota: Make sure we don't install on top of an incompatible system

If the system has data present, make sure said data doesn't depend
on a system signature different from our own. If we can't find
our platform key, abort the installation

Change-Id: I16572daf9464de326a9d0d126597cfbf03208f94