Merge pull request #18 from bernhardlutz/master

adding image conversion tool
documentation enhancements
Merge branch 'master' of https://github.com/bgruening/galaxytools
bug fix reported by Ralf
add definition for zlib library
macs2 enhancements
tpp bugfix
adopt eigen installation to latest Galaxy release
Merge pull request #19 from bernhardlutz/master

help and testcase
bug fix
adding beta of rnatools