feat(message): Add notification functionality

[edcarroll]

PR is WIP

This PR adds toast style notifications to the message components, as outlined in #103.

Will update this comment with more info when I have more time.

[edcarroll]

@mcosta74 remade the PR manually so the diff is no longer stupid.

[harogaston]

What is the status on this? @edcarroll do you need extra hands?

[edcarroll]

@harogaston component is fully implemented, just want some feedback on the interface and how it works 😄 Check out the test component which has an active demo

[jmls]

as per gitter

• can a notification have colors - like the existing message container
• can a notification have logos / images etc like the message container
• can a notification be placed in the middle of the screen
• can the progress bar go from left to right
• can a notification use an ng-template for the message ?

for (1) and (2) I basically think if you could make a notification have the same ui as a message that would be great , as it would handle the colors, icons etc

[jmls]

is it likely that this pr will make it into the main codebase ? Been waiting on it for some time now ;)