Update some changes to syslog API
Make it possible to enable/disable invokedynamic after boot.

* Deprecate loaded-once static values from RubyInstanceConfig.
* Use Option.load everywhere static values were used.
* Move to using released "options" library.
Add a --dev flag that disables our JIT and forces Hotspot tier 1.

Specifying the --dev flag adds the following JVM flags to startup:

-XX:+TieredCompilation
-XX:TieredStopAtLevel=1
-Djruby.compile.mode=OFF
-Djruby.compile.invokedynamic=false
Add --dev flag parts that work after JVM boot.
Merge remote-tracking branch 'origin/jruby-1_7'

Conflicts:
	core/pom.xml
	core/src/main/java/org/jruby/RubyInstanceConfig.java
	core/src/main/java/org/jruby/ir/targets/Bootstrap.java
	test/externals/ruby1.9/excludes/TestSyslog.rb