Allow users to specify build version by passing -Pvers=someversion to the command line

Author: JaciBrunning

build.gradle

@@ -15,7 +15,6 @@ plugins {
 }
 apply plugin: 'nebula-aggregate-javadocs'
 
-
 def getGitCommit = { ->
     String HEAD_REF = new File(rootDir, '.git/HEAD').text.replace("ref: ", "").replace("\n", "")
     String COMMIT_HASH = new File(rootDir, ".git/${HEAD_REF}").text.substring(0, 7)
@@ -27,6 +26,7 @@ def getGitCommit = { ->
  * http://ryanharter.com/blog/2013/07/30/automatic-versioning-with-git-and-gradle/
  */
 def getVersionName = { ->
+    if (project.hasProperty("vers")) return vers
     try {
         def stdout = new ByteArrayOutputStream()
         exec {
@@ -41,6 +41,7 @@ def getVersionName = { ->
 }
 
 def getVersionSimple = { ->
+    if (project.hasProperty("vers")) return vers
     try {
         def stdout = new ByteArrayOutputStream()
         exec {