Created Temasys.opts variable for forceGetAllCams

Added an opts variable at the top. Right now only contains getAllCams
variable.

You might want to use the full forceGetAllCams name.

I’m sure other variables will arise later.
Added Option to Prevent Install Prompt

Will allow users to prompt for installation using their own modal and
still use the CDN version of adapter.js
Created Public Function to Access Plugin State

I created a function that will check if the plugin state is none. After
the page has loaded, this will reliably show that no plugin has been
installed.

If the plugin has been installed, the state will be injecting /
injected.

The current function, Temasys.WebRTCPlugin.isPluginInstalled, takes too
many options and does not have a return value.

It would be better not to access Temasys.WebRTCPlugin.pluginState in my
external code, as this internal API could change in the future.
Merge branch 'tomfitango-master' into development
pull request #16: changed opts to options, removed functions that were not relevant from the AdapterJS side, changed showPluginInstallPrompt to hidePluginInstallPrompt, we want it on by default