Merge pull request #246 from krakjoe/master

Array methods: shift/pop/range
Merge pull request #247 from krakjoe/master

nodelref array range
Merge pull request #248 from krakjoe/master

Array.erase (+test and leakchecked) and some other things
- Added -l flag to bison
- Fix conflicts
Merge branch 'master' of https://github.com/clever-lang/clever