more android XML changes

[mlc]

This makes some good changes:

• moves imports to the top of the build.rb like they belong
• prefixes generated android color names with foundation_ so as not to conflict with existing colors
• adds an XML comment with today's date
• omits certain empty comment lines from the generated XML

And one pretty scary change:

• uses a lower-level API to Psych, ruby's default YAML library, so that we can learn if a color entry is an alias or not. When it is an alias, use Android's resource aliasing feature instead of repeating the ARGB values in the output. This means that the YAML reading is now much more fragile with respect to structure changes or differences, and the ruby code is much more unreadable. But it works, so…

[akdetrick]

this ruby was already somewhat unreadable

[mlc]

On 01/27/2015 12:01 PM, Adam Detrick wrote:

this ruby was already somewhat unreadable

you can count on me to finish the job!