Force the project name to a string or path.resolve will ignore it later.
Without this exports with only digits in their name cannot be exported
Merge pull request #1890 from Ryanl92/integer-export-fix

Force the project name to a string or path.resolve will ignore it later.
Added a test for anti-meridian spanning exports in mbtiles format
expose tiff and jpeg image formats in command line interface
amend #1890 to ensure that if no argument is passed on the command line then we still get proper usage rather than a toString exception
pull in tilelive-mapnik@0.5.0
Merge branch 'master' into export-anti-meridian
Merge remote-tracking branch 'upstream/master' into export-anti-meridian
Serialize export progress so resuming from job file works correctly
Report progress for multiple part mbtile exports