add fasttime support for POSIX formats
adjust posix regexp to avoid passing ISO8601 to fasttime
add modified tparse.c from fasttime package
add backup and dll files to gitignore
white-space cleanup
add fasttime description to docs
add commented speed tests
parse_date_time returns POSIXct

    Makes parsing way faster for fasttime POSIX. It was also documented
    as such but not honored.
explicit force_tz is needed when fastPOSIXct is used
add C level parse_hms for fast (and correct!) hms/ms/hm parsing
R interface to hms/ms/hm C code + docs + tests
NAMESPACE useDynLib adjustment
add Simon Urbanek to contributors
comment C function pare_hms
add R level wrapper .parse_hms
incorporate Hadley's style comments
new full featured C date_time parser: parse_td

  + front end function parse_date_time2
move .strptime into parse.R where it belongs
cosmetics in .select_formats
rewrite parse_hms