use formatting to make command output clearer

[mykmelez]

Oghliner's output is quite simplistic, just plain text without any special formatting. By contrast, other popular command-line tools, like Yeoman (npm install -g yo && yo), use color, boldness, and other stylistic formatting to clarify the text they output to the console. (Yeoman even prints ASCII art, although that's a bit extraneous.)

We should evaluate the output of the various Oghliner commands for opportunities to use formatting to make them clearer.

• Use gutil.log to log messages (Use gutil.log to log messages; log errors/warnings in red #131)
• Print colored warnings and errors (Use gutil.log to log messages; log errors/warnings in red #131)
• Clarify output of configure (clarify output of configure command #148)
• Print large file warning in yellow (Print large file warning in yellow #151)
• Print all suggestions in blue (Use blue for all suggestion messages #156)
• Clarify output of bootstrap (clarify output of bootstrap command #160)
• Clarify output of integrate (clarify output of integrate command #161)
• Clarify output of offline (clarify output of offline command #162)
• Clarify output of deploy (clarify output of deploy command #163)

[marco-c]

We should also improve error messages, using console.error doesn't give much details.

[marco-c]

#131 improves the situation.

[mykmelez]

It might be a bit further afield, but I see enhancements like #141 as keeping with the spirit of this issue.

[mykmelez]

All dependencies resolved, so this too is resolved!