userland #66

Now returns correct codes on exit(). Good run returns
EX_OK(0), bad command line parameters return ES_USAGE(64),
camera failure EX_SOFTWARE(70).

Codes from sysexits.h were used.

Doesn't yet implement the 'strict' option suggested by a
contributor on github, I'm not convinced that's all that
necessary.
userland #66

Now returns correct codes on exit(). Good run returns
EX_OK(0), bad command line parameters return ES_USAGE(64),
camera failure EX_SOFTWARE(70).

Codes from sysexits.h were used.

Doesn't yet implement the 'strict' option suggested by a
contributor on github, I'm not convinced that's all that
necessary.

Updates docs files to include all recent changes.
Merge pull request #96 from JamesH65/fix_exitcodes

Userland #66 Add exit codes to the camera apps
userland #35 Removed exposure off option

This is never going to work as expected, so removing the option
completely.

Updated docs, incremented version by 0.01
Merge pull request #97 from JamesH65/remove_exposure_off

userland #35 Removed exposure off option