v0.3 release doesn't work on Linux amd64

[javier-lopez]

The current v0.3 release doesn't work on Linux amd64, I've not tested it on other platforms, so I'm not sure if the same issue is present in other systems.

Steps to replicate

$ wget -O nigit https://github.com/lukasmartinelli/nigit/releases/download/v0.3/nigit_linux_amd64
$ echo '#!/bin/sh' > echo.sh
$ echo 'echo $SAY' >> echo.sh
$ chmod +x nigit echo.sh
$ ./nigit echo.sh
2016/10/29 23:33:27 INFO ▶ Serve from port 8000 with 5 seconds timeout
2016/10/29 23:33:27 INFO ▶ Handle /echo -> echo.sh
2016/10/29 23:33:27 CRITICA ▶ Executable program  not found

Compiling from source with go get github.com/lukasmartinelli/nigit works fine, so the problem probably is within the latest commits before releasing v0.3

[rvanmarkus]

same issue here on Mac OS X

[JC1738]

Compiling from source does fix the problem or targeting v0.2