Allow boolean flag with .demand()
Merge remote-tracking branch 'chevex/master' into demand-option
Added 'require' and 'required' as synonyms for 'demand'
Replaced short with alias in example. Resolves #28
Remove unneeded dependency

The dependency on 'minimist' is not used anywhere in the code (we bundle
our own version).
s/pour/pore/
Merge pull request #35 from ryansb/patch-1

s/pour/pore/
1.3.0
Merge pull request #33 from nylen/remove-minimist

Remove unneeded dependency
Merge pull request #29 from chrisn/demand-option

Allow boolean flag with .demand()
1.3.1