Merge pull request #107 from xrotwang/master

one more test, 3% more coverage :)
included random tree in tree class
integrated function for random trees with branchlengths from @phylostar, this fixes #105, thans a lot to @phylostar
update setup py, realized that this also fixes #93
removing non-lingpy specific stuff
Merge branch 'master' of https://github.com/lingpy/lingpy
Merge pull request #110 from bambooforest/master

Clean scripts directory
remove tokenizer
fixed requirements for tests