Encoding issues

[missinglink]

As reported by several people such as pelias/pelias#805 and #16

There is an encoding bug where the requests sent by the compare app are incorrect in the following conditions:

• text param is present and not the final param
• text contains a reserved URL character such as & or #

[orangejulius]

Note that as of 59ae413 the text param is no longer given special handling: too many people were reporting the same issue or being confused. And its very unlikely the readme could have helped.

So now any & in the text parameter will be treated as an HTTP parameter separator.