Fixes #299, closes #300

Fixes #288

Fixes #280

Otherwise web pages will be actually opened if the default browser
command is not `open`. Browse tests will all fail as the command will
show up in history only when the fakebin `open` acts as the browser.

Fixes #274

Fixes #232, references #270

Thanks Yahor Radtsevich

References #232, #40, #236

references #269, #189

Fixes #263

Fixes #254

Fixes #252

Tries to fix #261

This ensures we end up with the correct capitalization of user's login
name, and gives the opportunity to the server to change the project name
without having us choke on it.

Fixes #263

 - performs a single API call instead of 3
 - simpler handling of parent repo data
 - less brittle implementation

Closes #257, references #146

The problem was that the dumb JSON generator simply dumped strings with
Ruby's `inspect` method, which on 1.8 generates escape sequences that
are incompatible with JSON.

Now strings are dumped simply as they are, with only a handful
characters escaped (double quote, backslash, whitespace).

Fixes #235

References #257, references #247

Fixes #245

References #235

This ensures that a Hub command can't accidentally kill tests.