Bump for 1.7.4

Update version to 0.8.8 for renamed Wait*able exceptions.

Bump version for jruby-openssl-0.8.6.

Tag jruby-openssl 0.8.4

Bump for 1.7.3

Bump version for 1.7.2

Tag jruby-openssl 0.8.2.

Bump jruby-openssl to 0.8.1 for release.

jruby-openssl-0.8.0 corresponds to JRuby 1.7.1.

Update install4j to know about gems subdir