BLD: fix syntax errors in bento.info
BLD: fix Bento build issue with new .h.src templating.
TST: add Bento build to Travis CI runs.
MAINT: remove useless email notification in .travis.yml
DOC: update version number in bento.info
BUG: Fix missing NULL check in lexsort

When Getitem of the lexsort sequence argument failed
this was not checked.

Closes gh-4123
Merge pull request #4124 from seberg/issue-4123

BUG: Fix missing NULL check in lexsort
Merge pull request #4114 from rgommers/travis-bento

Fix Bento issues and add Bento build to Travis CI config
ENH: Attempt to rewrite the index parsing.

Some optimizations still missing.
WIP: Speed improvements by using EXTERNAL_LOOP
WIP,TST: Fix tests to match new behaviour
WIP: use fast_take and fix Deprecations
WIP,TST: Small fixes for the tests
WIP: bug fixes and field oder access change
WIP,TST: Fixup python3 tests
WIP: fix field order; And MapIterNext iteration end
WIP,TST,DOC: tiny fix

maybe triggers Travis too...
WIP: Move Ellipsis setting check and clear warnings
WIP: Restore binary compatibility of MapIterObject (hopefully)
WIP,ENH: Already allow boolean scalars for 0-d arrays

Since indexing into a 0-d array with an integer is impossible,
we can disable any conversion/interpretation is integer code
to special case the 0-d array for now and fix this annoying
issue...