Bug 1037211 - Remove redundant --enable-content-sandbox-reporter.

It's enabled by default on B2G as of bug 979590, so this shouldn't
change anything.
Merge pull request #178 from jld/bug1037211

Bug 1037211 - Remove redundant --enable-content-sandbox-reporter. r=kang
Bug 1029533 - Add libmtp.so to libraries needed to build libxul.so
Merge pull request #180 from dhylands/add-mtp

Bug 1029533 - Add libmtp.so to libraries needed to build libxul.so. r=mwu
Bug 907890 - show gecko make commands when using showcommands target r=mwu
Bug 1048024 - Updates for forking B2G and Nuwa from the same process.
Bug 1047350 - Expose SDK version, needed to generate proper Edify scripts
Merge pull request #183 from lissyx/bug1047350

Bug 1047350 - Expose SDK version, needed to generate proper Edify scripts r=gsvelto
Bug 1048905 - Copy icon-font into system/fonts/hidden/ on build
Merge pull request #186 from janus926/bug-1048024

Bug 1048024 - Updates for forking B2G and Nuwa from the same process. r=dhylands
Bug 1050026 - Fix b2g-info to use pid and ppid to determine main/child processes.

Addressed review comments
Merge pull request #188 from dhylands/fix-pids

Bug 1050026 - Fix b2g-info to use pid and ppid to determine main/child processes. r=tchou
Bug 1050026 - Address reentrancy problem for b2g-info.
Merge pull request #189 from dhylands/fix-pids2

Bug 1050026 - Address reentrancy problem for b2g-info. r=khuey
Merge pull request #187 from wilsonpage/1048905

Bug 1048905 - Copy icon-font into system/fonts/hidden/ on build
Bug 1022928 - Build symbols for vendor libs.

Include the vendor libraries directory in the buildsymbols path.
Bug 1059992 - be less verbose about non-gecko build output r=dhylands
Bug 1054331 - Build valgrind only when B2G_VALGRIND=1.

The b2g.mk script only checked if B2G_VALGRIND variable was empty, so
even when it was set to 0, valgrind was built.

Now we check if the B2G_VALGRIND value is 1, so if it empty valgrind
will not build.
Merge pull request #179 from walac/master

Bug 1054331 - Build valgrind only when B2G_VALGRIND=1. r=dhylands
Bug 1022728 - Depend on gaia-prefs rather than profile.tar.gz