Generalise parameter syntax

[falkecarlsen]

Rather than having no-args mean 'connect to home', as per issue #3, syntax should be generalised.

This should take the form of: ./chwifi ssid passphrase?, where a question-mark signifies optionality.

Currently, the script has the main functionality of handling a use-case of a user primarily using two wireless networks, which is not very extensible. Implementing this syntax allows connecting to arbitrary networks, both networks that are already configured and unknown networks.

This would result in the script becoming a CLI-wrapper for network managers with the enhanced feature of auto-caching passwords for rolling password networks.

[falkecarlsen]

Merge a260900 resolves the no-args issue and implements help-printing. This opens up the possiblity to define syntax as ./chwifi <profile> <passphrase>?, where passphase is optional.

[falkecarlsen]

Merge 700db47 resolves the MAC-spoofing-issue but also implements an abstracted connection-routine function, which is the main requirement for this issue.

[falkecarlsen]

Issue mostly closed by c2cf441, but the chwifi ssid passphrase? could be a welcome addition.

[Badgie]

#33 may fix this, in the sense that a user can create a new netctl profile using wifi-menu -o or similar, and this profile will be imported into the config on update.

[falkecarlsen]

This helps, but does not completely consolidate all network-related activities in chwifi. This probably isn't the aim of chwifi anyway, but I don't think we should resolve #6 on #33.