Start 1.7.3 development

Change-Id: I2ea92e0ece423e048701bdc5f34f815deabc0b57

pom.xml

diff --git a/pom.xml b/pom.xml
index 640268a..024ce78 100644
--- a/pom.xml
+++ b/pom.xml
@@ -21,7 +21,7 @@
   <groupId>gwtorm</groupId>
   <artifactId>gwtorm</artifactId>
   <packaging>jar</packaging>
-  <version>1.7.2</version>
+  <version>1.7.3-SNAPSHOT</version>
   <name>gwtorm</name>
   <description>Tiny ORM</description>
   <url>https://gerrit.googlesource.com/gwtorm</url>