Adding spec entry for HeapSort
Fixing a typo; Adding a note about the reverse argument
Initial draft of associative implicit addition section for spec
Update to reflect qthreads as the default tasking layer.
Merge branch 'master' of github.com:chapel-lang/chapel into doc-tasks-qthreads
Removing tcmalloc 1.7
Updating tcmalloc README
Snapshot of REGRESSIONS based on last night's runs
Adding a comma
Minor edits to README.llvm

Defined the acronym SROA, fixed a typo, and added a comma for clarity.
Merge pull request #506 from benharsh/remove-tc-17

Remove tcmalloc version 1.7 and update the README to reflect usage of gperftools-2.2.
Add arrayVectorOps and randomNumbers to primers/Makefile

These two new primers didn't get added to the primers Makefile until now.
More updates to reflect qthreads as default tasking.

README.chplenv:
- Put qthreads in front of fifo in list of tasking layers.
- Update description of default setting for CHPL_HWLOC.

README.executing:
- Update description of dataParTasksPerLocale default value.
- Update which tasking layers support -b and -t.

README.tasks:
- Swap order of qthreads and fifo tasking (qthreads first, as more
  important).
- Update stack overflow discussion to reflect setting execution-time
  default via compiler --[no-]stack-checks option, etc.  This leads to a
  bit of redundancy in the README, but too much information is better
  than too little, and we can improve this further when stack overflow
  checking is handled the same in all tasking layers.

README.cray:
- One adjustment to reflect default qthreads tasking.

README.localeModels:
- Do a little reformatting of too-long lines.
- Remove a now-superfluous mention of qthreads+hwloc being the default
  tasking layer with NUMA.
- Update Qthreads thread schedulers used for various CHPL_LOCALE_MODEL
  settings.
Update the name of primer random to randomNumbers in READMEs

The name of this primer changed to avoid a name conflict on case sensitive
filesystems.
Take Mike's suggestion into account.
Merge pull request #509 from bradcray/triage-sep-blc

Snapshot of REGRESSIONS based on last night's runs

Bad:
- memLeaks/promotion failed in --baseline testing

Good:
+ memLeaks/promotion no longer failing in compilation (except in cygwin which lags by several hours)

Business as usual:
* regex cygwin failure back again -- makes sense since re2 was accidentally disabled for a night
* a few other cygwin timeouts have returned; noting them here for now to look at them more before handing off
Merge pull request #508 from daviditen/primersMakefileUpdate

Add arrayVectorOps and randomNumbers to primers/Makefile

We forgot to add these two to the primers/Makefile. Add them. Also, updated the name of random to randomNumbers in two READMEs.
[reviewed by lydia-duncan]
Merge pull request #507 from lydia-duncan/docFreezeLLVM

Minor edits to README.llvm [reviewed by Mike]

Defined the acronym SROA, fixed a typo, and rephrased a paragraph slightly.
Adding optional 'reverse' argument to function delcaration
Moving associative section below rectangular; better wording