Detect errors from enyo/deploy.js

Issue
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Build scripts were not failing on deploy errors

Cause
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Scripts were not set up to stop on errors

Fix
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Add error detection
Just making a note that we do not error when there is a copy error, such as in the case where we have moved some of the resource directories (i.e. enyo or other libraries). Here is the output for reference:

    node /Users/aaron/Documents/git/bootplate/tools/../enyo/tools/deploy.js -T -s /Users/aaron/Documents/git/bootplate/tools/.. -o /Users/aaron/Documents/git/bootplate/tools/../deploy 
    Minify-ing Enyo...
    Minify-ing the application...
    cp: no such file or directory: lib/onyx

    Success: the deployable application is available in:  /Users/aaron/Documents/git/bootplate/deploy