Add more template actions

- `s -t blah` -- edits or creates and edits a template "blah"
- `s -t` -- lists available templates
Add non-terminal echoing functionality

- `echo $(s)` -- prints $S_BIN_PATH to stdout
- `echo $(s -t)` -- prints $S_TEMPLATE_PATH to stdout
- `echo $(s blah)` -- prints path of "blah" script to stdout
- `echo $(s -t blah)` -- prints path of "blah" template to stdout
Merge branch 'master' of github.com:davesque/s