travis: Move the hardware directory one level higher

Apparently, having the hardware directory within the current directory does not
work all that well now, and Arduino fails to find it. Moving it one level
higher, outside of the cloned sources, and all is well.

This is the major part of the fix for #27.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

.travis.yml

@@ -3,10 +3,10 @@ sudo: false
 os:
 - linux
 install:
-- mkdir -p hardware/
-- ln -s `pwd` hardware/keyboardio
+- mkdir -p ../hardware/
+- ln -s `pwd` ../hardware/keyboardio
 script:
-- make travis-test-all BOARD_HARDWARE_PATH=$(pwd)/hardware
+- make travis-test-all BOARD_HARDWARE_PATH=$(pwd)/../hardware
 branches:
   except:
   - gh-pages