MAINT: Extended the STASH_TRANS table
ENH: Nearest neighbour regrid adds crs.

This adds the crs to the target grid if possible (is an iris coordinate
system).  There are also various documentation tweaks as part of this.
MAINT: Review actions taken
Merge pull request #894 from cpelley/regrid_doc_clarification

ENH: Nearest neighbour regrid adds crs.
Merge pull request #973 from cpelley/new_stash2lbfc

MAINT: Extended the STASH_TRANS table
BLD: Scipy travis update to 0.12.0