Merge pull request #16 from gavinsimpson/master

Myriad fixes to get neotoma to build & pass checks
Merge pull request #18 from gavinsimpson/master

Switch to importing reshape2 instead of depending on reshape
Merge remote-tracking branch 'upstream/master'
Merge pull request #20 from gavinsimpson/master

Compress taxon.list.RData
Merge remote-tracking branch 'upstream/master'
speed-up get_download, return a data frame for counts, bug fix
check if error and bail earlier
Remove Sample column from counts data frame, set these as rownames
Merge pull request #22 from gavinsimpson/issue21

Speed-up get_download, fix #21, and a range of other improvements