Accept Encoding object for Encoding.compatible?

With this change, the following calls are supported:

    Encoding.compatible?(Encoding.find("UTF-8"),
                         "String".force_encoding("UTF-8"))
    # => #<Encoding:UTF-8>

    Encoding.compatible?("String".force_encoding("UTF-8"),
                         Encoding.find("US-ASCII"))
    # => #<Encoding:UTF-8>

    Encoding.compatible?(Encoding.find("UTF-8"),
                         Encoding.find("US-ASCII"))
    # => #<Encoding:UTF-8>
Add const_get to java package Fixes #435
We survived the Mayan Apocalypse!
Eclipse: filter out gems from scanned resources

lib/ruby/gems/* gets bigger and bigger and make Eclipse file scanning
slower.
[IR] Improve upon c73cc11 - add uncaught break handling on demand.

* Commit c73cc11 added global rescue to catch uncaught breaks
  in lambda closures and throw a local-jump-error.  But, this is
  a little excessive and impacts performance some for the
  interpreter.  Updated code to add the global rescue only when
  the interpreter encounters a lambda.  This leaves correctness
  intact and eliminates the try-catch on the vast majority of
  closures in ruby code.

* This opt. is not yet available to the JIT code as of this patch.
  To be explored later.

* Recovers lost performance from commit c73cc11.
Fake cext rb_sourcefile(), rb_sourceline(), ruby_sourcefile.  Fixes #467.
File.truncate should not move write pointer
Merge pull request #473 from atambo/file_truncate

File.truncate should not move write pointer
Fix ffi/ffi#242 by coercing objects passed as :string parameters via #to_str
[IR] Fix IR JIT breakage from b95700d

* Was missing an instanceof check. Fixed now.
Implement fix for ffi/ffi#239 from ruby-ffi
Fix jruby-complete not working with new jossl packaging changes
GH #360: Non-ASCII character escape sequence in string_content results in SyntaxError
Remove libjffi-1.0.jnilib that was checked into git sometime in the past.
Bump version for 1.7.2
update for next dev release
Merge pull request #465 from atambo/const_get

Add const_get to java package Fixes #435
Merge pull request #457 from kou/support-encoding-object-for-encoding-compatible-p

Accept Encoding object for Encoding.compatible?
Reduce cost of repeatedly invalidating global variables.

* Mark all variables as GLOBAL, THREAD, or FRAME scoped
* Only perform indy caching for GLOBAL
* Failover to direct access every time after 100 failures
* Add a failover invalidator that eventually stays invalid

In order to avoid the impact of invalidating global variables that
are modified continually during the run of an application, I've
added a config parameter (invokedynamic.global.maxfail) to fail
those variables and not continue caching them using invokedynamic
and a SwitchPoint. On the update side, I added a new Invalidator
called FailoverSwitchPointInvalidator that eventually gives up and
stays invalid, since even invalidating an unused SwitchPoint is
rather expensive.

With these changes, highly-volatile global variables perform as
well as without invokedynamic, rather than much slower.
Use single-arg version of RubyClass#newInstance(), instead of the IRubyObject[] variant