New Theme Engine [2/6] CM11 Themes

See frameworks/base themes commit for full summary.

[SUMMARY]
1. Modifies idmap binary to include target APK in filename. Needed so one theme apk can have multi targets.
2. Allows aapt to be called via installd. Needed to compile resources found in a theme apk's assets folder.

[IDMAP EXAMPLE]
OLD: vendor@overlay@overlay.apk@idmap
NEW: vendor@overlay@overlay.apk@system@app@target.apk@idmap

[CONTRIBUTORS]
Andrew Mast <andy@cyngn.com>
Clark Scheff <clark@cyngn.com>
Special thanks to Mårten Kongstad and the rest of the Sony team for their work in idmap.

Change-Id: I0cb15830109ac36780c015e61348c00ec08d24a1
CM11 Themes: Common overlay for sharing resources. [2/2]

Change-Id: Ied21ede2f36ba16dd190bc1e6cec44fd8560ca90
CM11 Themes: Store hash codes for target and overlay in idmap

Due to some system packages always having the same last modified
time stamp of 08/01/2008 we must use some other unique value to
determine that the contents of either the target or the overlay
have changed.  This unique value will be passed down from the java
layer and written to the idmap header.

This change requires the following patch from frameworks/base
http://review.cyanogenmod.org/62565

Change-Id: I0adcafaca96110268766d6e3349414364ecea4c3