Unbitrot tools/get_gc_cc_log.py, so it works again.

Also let the script get abbreviated gc logs, after bug 890135.
Bug 891217: add emulator-x86-jb. r=mwu
Merge pull request #257 from vicamo/bugzilla/891217/emulator-x86-jb

Bug 891217: add emulator-x86-jb. r=mwu
Change get_about_memory.py so that it pulls gc/cc logs by default.
Merge remote-tracking branch 'upstream/master'