more formats:
o fractional seconds
o absolute time formats
o generalized engineering notation
o better resolution in splitting format strings
o support for LO uppercase date+time formats
other changes
- no more prototype pollution
- many many more tests
- passes jshint
- code coverage: blanket + coveralls + travis
- npmignore test files
- removed ssf_node.js: scripts should define DO_NOT_EXPORT_SSF to prevent export
- added ssf binary
- updated frac to 0.3.0
- entire table can be pulled and saved
- choose_fmt and format functions can take an external table
- LICENSE year updated
- removed unused tests
