Some yield arg-handling improvements

Make Enumerable#all, #none, #one, and #find_index behave to spec in the
case of #each yielding multiple values (also remove zip_tags.txt while
we're in there since it's passing)
fix for issue #969 (missing string intern for symbols in literal symbol array)
remove doublicated dependency #972
Refactor compiler specs to use 'let','match_array','expect',be_nil'
Fix concurrency issue in constant caching.

Because updating the constant cache for a piece of compiled code
is not atomic (multiple cache structures must be updated) it was
possible for the tests in isCached and isCachedFrom to see a non-
null value in the "constants" array before the invalidation
structures in the other arrays (constantGenerations,
constantInvalidators, constantTargetHashes) were set. This allowed
the first "value != null" check to pass, proceeding to access the
object in constantInvalidators even if it was still null.

By moving the update of the "constants" array after the update of
the invalidation structure arrays, we mostly guarantee they'll be
up-to-date before the value is non-null.

Note that this is not necessarily true given reordering and
volatility on the JVM. The RuntimeCache needs to be reexamined to
ensure happens-before on these particular non-atomic structure
updates.
Merge remote-tracking branch 'origin/master'
Propagate Ruby's cwd to Java via Dir.chdir

Ruby.setCurrentDirectory() is responsible for doing the work.
Ignore SecurityException for now. (Though a warning might be
appropriate.)

Fixes #971.
Maintain 1.8 compatibility in Dir.chdir spec
Revert "Maintain 1.8 compatibility in Dir.chdir spec"

This reverts commit e124632ac52f92d7dccd44e8c906673fc6993ab9.
Revert "Propagate Ruby's cwd to Java via Dir.chdir"

This reverts commit 42198651fe5ead7d14df97641588a9dbf4711e9e.

Need to fix Embedded tests.
Properly look for encoding in first ivar from marshal stream.

Fixes #939.
Merge remote-tracking branch 'origin/master'
Merge pull request #968 from rajcybage/refactor_rspec

Re factor compiler specs to use 'let','match_array','expect',be_nil'
Reinstate Marshal.dump tags

These are not fixed yet.
[IR] Fixed bug in CallSite profiling: added call site versioning

* Because of inlining, different versions of the same scope
  can be active at the same time.  So, a call-site from a scope
  can actually be from different versions of the scope.  It is
  important to distinguish between versions for accuracy of
  profiling and correctness of inlining based on it.

* Fixed minor unrelated bug in instruction cloning in RuntimeHelperCall
Make it simpler to run this without cd'ing
Make sure eof advances event location so it matches parser events proper column (whose behavior really makes no sense to me)
Emulate MRI bug..still need to report it
Stop trying to use our lexing and use same stragegy as MRI
Remove errant nextc so we don't read one past #