updated contributors list
util: fixed a bug in str_to_time

str_to_time didn't work for negative timestamps on 32bit machines
datacube: now works on 32bit linux
Merge branch 'master' of github.com:emolch/pyrocko
gse2: fixed reading some nonstandard gse2.0 files
added missing dependency
some pep8 tryouts
some pep8 tryouts