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
- Updated frac to 0.3.1 (issue with numbers exceeding 2**32)
- Invalid dates render empty string
- Sub-second string format
- First steps towards Engineering format
- Fraction formats don't render blanks in the case of zero
- Trailing spaces removed
- More implied tests
