First pass at pipeline build comment javascript.

Signed-off-by: Frank Kotsianas <fkotsianas@pivotal.io>
Fix whitespace.

Signed-off-by: Frank Kotsianas <fkotsianas@pivotal.io>
Markup, CSS and controller for pipeline build comments.

Signed-off-by: Frank Kotsianas <fkotsianas@pivotal.io>
Add HTML escaping modifier for comment input form.

Signed-off-by: Frank Kotsianas <fkotsianas@pivotal.io>
Check authorization when updating pipeline comment.

Signed-off-by: Matthew Boedicker <mboedicker@pivotal.io>