update code to reflect s/cornfig/os-config-applier/
update readme with s/cornfig/os-config-applier/
make readme more serious
correct default cfn-init-data path
Update README.md
include template path in missing key error.
Merge branch 'master' of github.com:tripleo/os-config-applier
Use argparse as optparse is deprecated.

Also change the --validate option to match the variable name use in the
program, as it makes it easier for a user to map intentions to actual
code.
Add default templates path

Also shows defaults in --help for all options now.
add --print-templates option

This will let elements easily find where to drop their template files.
Merge pull request #2 from tripleo/ARG-PRINT-TEMPLATES

add --print-templates option
Add default value to arguments to main:

so that `os-config-applier` works immediately after a pip install.