add perception and tests (aimacode#1091)

* add perceotion and tests

* upadte requirements

* fix typo

* add utils and images for perception

* fix build error

* comment the last 2 agent tests

* fix build error

* change cnn test

Author: bruceyoungsysu

.travis.yml

@@ -17,6 +17,10 @@ install:
   - pip install Pillow
   - pip install pytest-cov
   - pip install ipythonblocks
+  - pip install keras
+  - pip install numpy
+  - pip install tensorflow
+  - pip install opencv-python
 
 script:
   - py.test --cov=./

agents_4e.py

@@ -35,7 +35,7 @@
 #
 # Speed control in GUI does not have any effect -- fix it.
 
-from utils import distance_squared, turn_heading
+from utils4e import distance_squared, turn_heading
 from statistics import mean
 from ipythonblocks import BlockGrid
 from IPython.display import HTML, display