streamtools 0.2.5

Lots of updates for this release.

For new blocks we have:

1. to / from AMQP blocks by Nick Jones (https://github.com/nickjones)
2. a javascript block that lets you execute arbitrary javascript, using the amazing go package "otto" by Robert Krimen (https://github.com/robertkrimen/otto)
3. an FFT block that uses the output of the existing timeseries block
4. to / from HTTPGetRequest blocks that allow you to form complex GET query responses

For low level changes we have

1. A block's query routes can now (optionally) support GET query parameters

For updates we have

1. bug fixes in the email blocks by JP Robinson (https://github.com/jprobinson)
2. new query endpoints for the cache block
3. updates and bugfixes to the GUI