Merge Samples into Master (dialogflow#1)

* Fix README instructions, command line argument parsing, and pom configurations

* Update deprecated create() methods to of()

Author: nnegrey

samples/README.md

@@ -103,7 +103,7 @@ mvn exec:java -DDetectIntentStreamMountainView
 DialogFlow API Detect Intent sample with text inputs.
 
 ```
-mvn exec:java -DDetectIntentTexts
+mvn exec:java -DDetectIntentText
 ```
 
 ### Entity Management
@@ -134,8 +134,16 @@ Create an entity type with the given display name
 mvn exec:java -DEntityTypeManagementCreate
 ```
 Delete entity type with the given entity type name
+
+Example output from `mvn exec:java -DEntityTypeManagementCreate`:
+"projects/java-docs-samples-testing/agent/entityTypes/86f57a32-483a-4818-b080-764dbcb31c6a"
+
+ENTITY_TYPE_ID=86f57a32-483a-4818-b080-764dbcb31c6a
+
+Use the outputted ENTITY_TYPE_ID from your `mvn exec:java -DEntityTypeManagementCreate` call
 ```
-mvn exec:java -DEntityTypeManagementDelete
+mvn exec:java -DEntityTypeManagementDelete  -Dexec.args='delete ENTITY_TYPE_ID
+--projectId PROJECT_ID' 
 ```
 
 ### Intent Management
@@ -150,8 +158,15 @@ Create an intent of the given intent type
 mvn exec:java -DIntentManagementCreate
 ```
 Delete intent with the given intent type and intent value
+
+Example output from `mvn exec:java -DIntentManagementCreate`:
+"Intent created: name:"projects/java-docs-samples-testing/agent/intents/5294c404-2516-47df-9a36-f0168ceca6f8""
+
+INTENT_ID=5294c404-2516-47df-9a36-f0168ceca6f8
+
+Use the outputted INTENT_ID from your `mvn exec:java -DIntentManagementCreate` call
 ```
-mvn exec:java -DIntentManagementDelete
+mvn exec:java -DIntentManagementDelete -Dexec.args='delete INTENT_ID --projectId PROJECT_ID'
 ```
 
 ### Session Entity Type Management