Merge

8009263: Fix all javadoc errors in nashorn code Reviewed-by: hannesw, lagergren

8009240: RegExpScanner code is inefficient and too complex Reviewed-by: jlaskey, lagergren

8009229: ant makefile default target should be "test" Reviewed-by: lagergren, jlaskey

8009150: Previous dead code elimination was incomplete Reviewed-by: hannesw, lagergren

8009146: Eliminate some dead code in preparation for immutable AST Reviewed-by: hannesw, lagergren

8009143: Eliminate Dynalink dependency on java.beans Reviewed-by: jlaskey, lagergren, sundar

8008950: jdk8/tl failing with SetupJavaCompilation BUILD_NASGEN contains missing directory -c on Windows Reviewed-by: chegar, sundar

8009021: nasgen should be run on boot jdk rather than currenly built jdk Reviewed-by: jlaskey

8006984: Introducing local into a function inside with statement confuses its scope Reviewed-by: jlaskey, lagergren, sundar

8008789: Enable java access and nashorn runtime tests for jtreg Reviewed-by: lagergren, jlaskey, hannesw

8008731: Separate configuration environment (options, error/output writer etc.) from Context Reviewed-by: hannesw, lagergren

8008776: Revise BuildNashorn.gmk for changes in new build system Reviewed-by: jjh Contributed-by: james.laskey@oracle.com

8008729: Make sure that we can run basic jsr223 tests using jtreg Reviewed-by: jlaskey, hannesw, lagergren

8006028: Integrate Joni regexp engine with Nashorn Reviewed-by: lagergren, attila

8008093: Make RegExp engine pluggable Reviewed-by: lagergren, attila