Merge branch 'master' of hyungil.jeong/pinpoint-profiler-optional

from pull request 6

README.md

@@ -0,0 +1,25 @@
+Pinpoint-profiler-optional
+=========
+
+아래와 같이 maven compile을 하기 위해서는 JDK 1.7+이 필요합니다.
+```xml
+<plugin>
+    <groupId>org.apache.maven.plugins</groupId>
+    <artifactId>maven-compiler-plugin</artifactId>
+    <version>2.5.1</version>
+    <inherited>true</inherited>
+    <configuration>
+        <source>1.7</source>
+        <target>1.7</target>
+        <debug>${compiler-debug}</debug>
+        <optimize>true</optimize>
+        <fork>true</fork>
+        <verbose>true</verbose>
+        <compilerVersion>1.7</compilerVersion>
+        <executable>${JAVA_7_HOME}/bin/javac</executable>
+        <encoding>UTF-8</encoding>
+    </configuration>
+</plugin>
+```
+
+환경변수에 JAVA_7_HOME을 잡아주시거나, maven의 settings.xml에 JAVA_7_HOME property를 설정해주세요.