Added integration tests

source/log4net-loggly.UnitTests/App.config

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <configSections>
+    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
+  </configSections>
+  <log4net>
+    <root>
+      <level value="ALL" />
+      <appender-ref ref="LogglyAppender" />
+    </root>
+    <appender name="LogglyAppender" type="log4net.loggly.LogglyAppender, log4net-loggly">
+      <rootUrl value="https://fake.logs-01.loggly.com/" />
+      <inputKey value="your-customer-token" />
+      <tag value="your-custom-tag" />
+      <logicalThreadContextKeys value="lkey1,lkey2,CommonProperty" />
+      <!-- optional -->
+      <globalContextKeys value="gkey1,gkey2,CommonProperty" />
+      <!-- optional -->
+    </appender>
+  </log4net>
+</configuration>