License Parser and update all license scripts

* Implemented a script that parses and replaces the license (to be used by git on every commit)
   * Implemented a shell script that makes use of the license parser to add the license to all java files in the repo
GSA-685 GSATDG-6 GSATDG-16

licensing/private_license.txt

@@ -0,0 +1,7 @@
+PRIVATE PRIVATE PRIVATE
+
+This is a test license for the GATK
+all files will abide to it
+one license to rule them all
+
+PRIVATE PRIVATE PRIVATE

licensing/protected_license.txt

@@ -0,0 +1,7 @@
+PROTECTED PROTECTED PROTECTED
+
+This is a test license for the GATK
+all files will abide to it
+one license to rule them all
+
+PROTECTED PROTECTED PROTECTED

licensing/public_license.txt

@@ -0,0 +1,7 @@
+PUBLIC PUBLIC PUBLIC
+
+This is a test license for the GATK
+all files will abide to it
+one license to rule them all
+
+PUBLIC PUBLIC PUBLIC