update changelog
bump to v93
Cleanup language pack config var setup, especially with PATH
always return @slug_vendor_base in slug_vendor_base
add quiet option for RakeTask#invoke
standardize all rake task usage through RakeRunner
Merge pull request #217 from heroku/cleanup_config_vars_path

Cleanup config vars, specifically PATH
bump to v94
changelog
remove last occurrence of install_language_pack_gems
changelog
bump to v96
bump to v97
changelog
when tagging a release, push commits to master
add jdk to the path if using JRuby
Merge pull request #220 from heroku/git_push_master

when tagging a release, push commits to master
Merge pull request #221 from heroku/jdk_path

JDK Path
update changelog
bump to v98