Fix some minor configuration problems in flex bundles (#1521)

Author: chanseokoh

plugins/com.google.cloud.tools.eclipse.appengine.facets/build.properties

@@ -5,4 +5,4 @@ bin.includes = META-INF/,\
                plugin.properties,\
                plugin.xml
 javacSource=1.7
-javacTarget=1.7               
+javacTarget=1.7

plugins/com.google.cloud.tools.eclipse.appengine.flex.test/.settings/org.eclipse.jdt.core.prefs

@@ -4,5 +4,4 @@ org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
 org.eclipse.jdt.core.compiler.compliance=1.7
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
-org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
 org.eclipse.jdt.core.compiler.source=1.7

plugins/com.google.cloud.tools.eclipse.appengine.flex/.settings/org.eclipse.jdt.core.prefs

@@ -4,5 +4,4 @@ org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
 org.eclipse.jdt.core.compiler.compliance=1.7
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
-org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
 org.eclipse.jdt.core.compiler.source=1.7

plugins/com.google.cloud.tools.eclipse.appengine.flex/build.properties

@@ -3,7 +3,6 @@ output.. = target/classes/
 bin.includes = META-INF/,\
                .,\
                plugin.xml,\
-               build.properties,\
                plugin.properties
 javacSource=1.7
-javacTarget=1.7 
+javacTarget=1.7