Bump from 1.5.4 to 1.5.5 because jruby-jars booch

Revert "Fix for JRUBY-4908: IO.popen4 returns the wrong pid in Linux"

This reverts commit edadd2b.

JRUBY-5011 (jrubyc --java): 'cannot find symbol' if function def has …

…more than 3 arguments

Bump 1.5 branch to upcoming 1.5.2

Update maven poms to 1.5.1

Update versions to 1.5.0

Bump to RC3

Tag out failing 1.9 spec

Tag out some failing specs in 1.9 mode

Bump version for 1.4.0