Library should escape about values when building fluiddb/about queries

[terrycojones]

There are two places in the code where queries are built involving fluiddb/about wherein the about value should have backslashes and double-quotes escaped before wrapping them in another set of double quotes. Instead of

query = 'fluiddb/about = "' + options.about + '"';

I think it should be

query = 'fluiddb/about = "' + options.about.replace(/\\/g, '\\\\').replace(/"/g, '\\"' + '"';

Unfortunately this will break code that is compensating for this bug by sending in already-escaped about values. But I think it should be fixed properly here.