Feature Request : Better Error Handling

[neoneddy]

So currently if someone misses a colon or something, the site goes offline. Only way to remedy is to find the php error log and track it down, or look over code by hand, it's usually something recently changed, but harder to find on large merges.

Proposed changes:

• Build SCSS button on manager side, it reports errors to console / modx error log
• If error is found don't write final css file / somehow fail to a safe working state.