trying to greate more obvious file naming convention for R code
allow passing col.defs and unit.defs directly
addresses #113
tests and documentation updated
remove data.set focused examples and methods
move eml_physical into own file (though not exported)
updated documentation
update README
acutally update README
table style that is compatible with github
Lots of small updates based around avoiding data.set

- Updated a handful of tests to remove depricated methods.
- Replaced the extraction method used by eml_get(eml, "data.frame").
The new approach is built more around functions than S4 methods.
Most importantly, it handles the type casting of columns more
explicitly, which requires comparing different parts of the metadata
(e.g. dateTime@formatString, not only ratio vs interval but integer
vs numeric, etc.)
- Updated the top-level interface to support col.defs and unit.defs all
  the way down.
add example to demo
eml_figshare creates a dataset instead of fileset, closes #109
Still cannot add multiple objects (EML+csv) to a figshare dataset. must be a fileset #109
fix external csv path method
add test for different ways to handle filenames as requested in #106
fix links, closes #119
remove remaining references to  in vignettes, )issue #113)
add other docs created in README.Rmd execution to examples dir