Add b2g-ps and killer to the product-package so that they will be installed in user builds

- Also make b2g-procrank only be installed when procrank is installed
Merge pull request #47 from dhylands/dhylands-issue-46

Add b2g-ps and killer to the product-package so that they will be instal...
Bug 805154 - Restrict what signals and to whom killer can send them.

This will allow us to make killer setuid root in the future, should
we decide to use this on production phones.

Note: killer is also now statically linked to close LD_LIBRARY_PATH
or LD_PRELOAD vulnerabilities.
Merge pull request #48 from dhylands/dhylands-805154

Bug 805154 - Restrict which signals killer can send and to whom it can send them.
Add header line to b2g-ps output. Add --oom option to show oom_score and oom_score_adj.
bug 774284 - The buildsymbols target should dump Gonk library symbols as well
Bug 794599 - Update Android.mk to use the new settings.py to generate settings.json
Merge pull request #51 from dhylands/dhylands-794599-3

Bug 794599 - Update Android.mk to use the new settings.py. r=vingetung
Revert "Bug 794599 - Update Android.mk to use the new settings.py to generate settings.json"

This reverts commit 8521da8ae93dec667c7af2bfc92472f9b1b26d51.
Merge pull request #52 from mvines/bustage

Revert "Bug 794599 - Update Android.mk to use the new settings.py..." a=bustage
Bug 794599 - Use settings.py to generate settings.json
Merge pull request #53 from dhylands/dhylands-fix-settings.py

Bug 808060 - Use settings.py to generate settings.json
Merge pull request #50 from luser/dump-gonk-symbols

bug 774284 - The buildsymbols target should dump Gonk library symbols as well
Merge pull request #49 from dhylands/dhylands-b2g-ps

Bug 810545 - Add header line to b2g-ps output. r=cjones
Don't strip gonk libraries while dumping symbols
Merge pull request #56 from luser/gonk-symbols-no-strip

Don't strip gonk libraries while dumping symbols
Bug 813791: Use the settings.json built by gaia. r=mvines
Add additional input/output support for b2g-ps/b2g-procrank
Merge pull request #58 from AlanHuang/addOOM_ADJ

Bug 813887: Add additional input/output support for b2g-ps/b2g-procrank
Add option for installing gaia apps to /system

Setting B2G_SYSTEM_APPS=1 will force all gaia apps to be installed
to /system