Merge pull request #9 from nalimilan/master

Documentation improvements about save.ffdf()
updating history
updated documentation

Merge branch 'master' of github.com:edwindj/ffbase

Conflicts:
	pkg/R/save_ffdf.R
	pkg/man/save.ffdf.Rd
removed :::
merged

Merge branch 'master' of github.com:edwindj/ffbase

Conflicts:
	pkg/NEWS
Added simple as.ram for ffdf
Added as.ram for ffdf as I like doing explicitely as.ram instead of writing [,, drop=FALSE]
- Fix for issue #10: with() can give wrong results
Merge branch 'master' of github.com:edwindj/ffbase
updated documentation
documentation fix.
Another stab at issue #10. Now checking for length.
added fix for issue #10
stops when with.ffdf produces an object that cannot be coerced to `ff` or `ffdf`.
Windows build issue
Fixed issue #11
Export table() to replace base function with a generic

Without this table.ff() is never called.