Rename brains to new names (#1321)

config/trainer_config.yaml

     curiosity_strength: 0.01
     curiosity_enc_size: 128
 
-BananaBrain:
+BananaLearning:
     normalize: false
     batch_size: 1024
     beta: 5.0e-3
-BouncerBrain:
+BouncerLearning:
-PushBlockBrain:
+PushBlockLearning:
     max_steps: 5.0e4
     batch_size: 128
     buffer_size: 2048
     time_horizon: 64
     num_layers: 2
 
-SmallWallBrain: 
+SmallWallLearning: 
     max_steps: 1.0e6
     batch_size: 128
     buffer_size: 2048
     num_layers: 2
     normalize: false
 
-BigWallBrain: 
+BigWallLearning: 
     max_steps: 1.0e6
     batch_size: 128
     buffer_size: 2048
     num_layers: 2
     normalize: false
 
-StrikerBrain:
+StrikerLearning:
     max_steps: 5.0e5
     learning_rate: 1e-3
     batch_size: 128
     num_layers: 2
     normalize: false
 
-GoalieBrain:
+GoalieLearning:
     max_steps: 5.0e5
     learning_rate: 1e-3
     batch_size: 320
     num_layers: 2
     normalize: false
 
-PyramidBrain:
+PyramidLearning:
     use_curiosity: true
     summary_freq: 2000
     curiosity_strength: 0.01
     max_steps: 5.0e5
     num_epoch: 3
 
-VisualPyramidBrain:
+VisualPyramidLearning:
     use_curiosity: true
     curiosity_strength: 0.01
     curiosity_enc_size: 256
     max_steps: 5.0e5
     num_epoch: 3
 
-Ball3DBrain:
+Ball3DLearning:
     normalize: true
     batch_size: 64
     buffer_size: 12000
     gamma: 0.995
     beta: 0.001
 
-Ball3DHardBrain:
+Ball3DHardLearning:
     normalize: true
     batch_size: 1200
     buffer_size: 12000
     beta: 0.001
 
-TennisBrain:
+TennisLearning:
-CrawlerBrain:
+CrawlerLearning:
     normalize: true
     num_epoch: 3
     time_horizon: 1000
     num_layers: 3
     hidden_units: 512
 
-WalkerBrain:
+WalkerLearning:
     normalize: true
     num_epoch: 3
     time_horizon: 1000
     num_layers: 3
     hidden_units: 512
 
-ReacherBrain:
+ReacherLearning:
     normalize: true
     num_epoch: 3
     time_horizon: 1000
     max_steps: 1e6
     summary_freq: 3000
 
-HallwayBrain:
+HallwayLearning:
     use_recurrent: true
     sequence_length: 64
     num_layers: 2
     summary_freq: 1000
     time_horizon: 64
 
-VisualHallwayBrain:
+VisualHallwayLearning:
     use_recurrent: true
     sequence_length: 64
     num_layers: 1
     summary_freq: 1000
     time_horizon: 64
 
-VisualPushBlockBrain:
+VisualPushBlockLearning:
     use_recurrent: true
     sequence_length: 32
     num_layers: 1
     summary_freq: 1000
     time_horizon: 64
 
-GridWorldBrain:
+GridWorldLearning:
     batch_size: 32
     normalize: false
     num_layers: 1
     summary_freq: 2000
     time_horizon: 5
 
-BasicBrain:
+BasicLearning:
     batch_size: 32
     normalize: false
     num_layers: 1