Bug 854121:  Regenerate sources.xml unconditionally rather than only when the underlying manifest changes.

It is quite common for the revisions underlying the build to change
without the manifest changing, for example, when "./repo sync" pulls a
few new gecko or gaia revisions.  This change makes us regenerate
sources.xml in those cases.
Merge pull request #76 from dbaron/master

Bug 854121:  Regenerate sources.xml unconditionally rather than only when the underlying manifest changes
bug 847351 add support for manifest inclusion to on-device manifests r=jhford
Bug 852852:  Assgin GAIA_PATH as "$(LOCAL_PATH)/../gaia" when it's not defined. r=mwu
When $(GAIA_PATH) is not exist make error message about it.
Merge pull request #77 from ChangbinPark/master

Bug 852852:  Assgin GAIA_PATH as "$(LOCAL_PATH)/../gaia" when it's not defined. r=mwu
Bug 853977- increase RLIMIT_NOFILE's soft limit to 2048 in init.b2g.rc r=mwu
Merge pull request #79 from sotaroikeda/bug853977-2

Bug 853977- increase RLIMIT_NOFILE's soft limit to 2048 in init.b2g.rc
Bug 851513 - Remove MozTT from package list
Add --nice option to b2g-procrank
Merge pull request #80 from dhylands/dhylands-b2g-procrank-add-nice

Add --nice option to b2g-procrank
Add missing semicolon to b2g-procrank.
Update prelink.map for changes to libraries.
Bug 862097 - set RLIMIT_NOFILE of b2g/content processes to 4096
Merge pull request #82 from sotaroikeda/bug862097

Bug 862097 - set RLIMIT_NOFILE of b2g/content processes to 4096=mwu
Add support to b2g-ps for -t (show threads) option
Merge pull request #83 from dhylands/dhylands-b2g-ps-threads

Add support to b2g-ps for -t (show threads) option. r=jld
Merge pull request #81 from ting-yuan/prelinkmap

Update prelink.map for changes to libraries.
Bug 855003 - Add build target for packaging emulator, r=mwu
Bug 869327 - Add rild into package list
Merge pull request #86 from EdgarChen/bug_869327

Bug 869327 - B2G Emulator: Upgrade hardware/ril, external/qemu to include RILv7/CDMA. r=vicamo