Move maven `pom.xml` from the java folder to the root folder.

This avoid to put the pom.xml file into the source directory. Normally the pom file is in a parent (/parent) folder and it is not mixed with the java source code.
An other thing is: this will make import of the project more easy from a IDE.

The side effect is that the target folder where maven build artifacts will move from the <flatbuffers>/java/target to <flatbuffers>/target therefore the gitignore file has been updated in consequences.

.gitignore

@@ -55,9 +55,10 @@ build/Xcode/FlatBuffers.xcodeproj/xcuserdata/**
 FlatBuffers.xcodeproj/
 java/.idea
 java/*.iml
-java/target
-**/*.pyc
 .idea
+*.iml
+target
+**/*.pyc
 build/VS2010/FlatBuffers.sdf
 build/VS2010/FlatBuffers.opensdf
 build/VS2010/ipch/**/*.ipch

java/pom.xml → pom.xml

@@ -33,7 +33,7 @@
   <dependencies>
   </dependencies>
   <build>
-    <sourceDirectory>./</sourceDirectory>
+    <sourceDirectory>java</sourceDirectory>
     <plugins>
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>