use gt_malloc() where possible
Merge pull request #85 from satta/mallocs

use gt_malloc() where possible
get rid of compiler warning (gcc 4.8.1)
Merge pull request #86 from gordon/master

get rid of compiler warning (gcc 4.8.1)
get rid of compiler warning

char doesn't have to be signed
Merge pull request #87 from gordon/master

get rid of compiler warning