fn: support for functions testing (#379)

* fn: add test framework

* fn: make routes creation smarter

* fn: add testframework examples

* fn: remove unnecessary dependency

* fn: update doc

* fn: fix consistenty between runff, runlocaltest and runremotetest

examples/testframework/local/README.md

@@ -0,0 +1,16 @@
+# Example of IronFunctions test framework - running functions locally
+
+This example will show you how to run a test suite on a function.
+
+```sh
+# build the test image (testframework:0.0.1)
+fn build
+# test it
+fn test
+```
+
+Alternatively, you can force a rebuild before the test suite with:
+```sh
+# build and test it
+fn test -b
+```