add pendulum environment example + general updates

docs/source/models.rst

@@ -13,7 +13,7 @@ Learning models can be divided into 2 categories:
 	- Polynomial models
 	- Deep Neural Networks (DNNs)
 	- Gaussian processes (GPs)
-- Trajectory based learning models:
+- Trajectory based learning models
 	- Dynamic Movement Primitives (DMPs)
 	- Central Pattern Generators (CPGs)
 	- Gaussian Mixture Models and Gaussian Mixture Regression (GMMs/GMRs)

docs/source/priorities.rst

@@ -1,3 +0,0 @@
-Priority Tasks
-==============
-

docs/source/pyrobolearn.rst

@@ -14,7 +14,7 @@ General idea.
 - lack of benchmarks
 - lack of flexibility and modularity
 - lack of generalization
-- high coupling
+- high coupling between different modules
 
 For instance: