Merge pull request #86 from andrewjpage/master

extend blocks over gaps
Merge pull request #87 from andrewjpage/master

translate snps and gaps to original genome space coords
Merge pull request #88 from andrewjpage/master

Span gaps
Merge pull request #89 from andrewjpage/master

move end block in correct number of snps
Merge pull request #90 from andrewjpage/master

typo in method, too many args
Merge pull request #91 from andrewjpage/master

dont move in twice
Merge pull request #92 from andrewjpage/master

remove duplicate move