add -retainids to `gt merge'
accept and ignore empty input GFF3s in tidy modes
gtruby: fix FeatureNode.set_source
properly initialize string buffers

Closes #282.
warn when weird characters appear in argv

Closes #241.
Update README.md

add link to gitter chatroom
closes #230
Merge pull request #283 from satta/sanger

Some bugfixes and minor feature additions
Merge pull request #284 from Garonenur/gitter

Update README.md
make sure an error is set before printing it
Merge pull request #287 from satta/addintrons-debug

make sure an error is set before printing it
update error message
cosmetics
add class(es) for sorted set of distinct numbers
use generated code instead of makros
Merge pull request #285 from Garonenur/intset

Add Intset
add GT-Prefix to Makros
Merge pull request #288 from Garonenur/intset

add GT-Prefix to Makros
update pre commit hook, remove unfunctional file
refactor intset

use abstract class for intset
add module that creates best class
cosmetics