patches for issue #4 and #5

Additional information of issue #4 is following:
* Latest version of JavaMail is 1.5.2. It contains a new experimental feature but this project does not use it, so it is not influencer.
* Latest version of Weld SE is 2.2.4.Final. It is based on CDI 1.2, not CDI 1.1 as Weld SE 2.1.1.Final. CDI 1.2 is maintenance release of CDI 1.1 and compatibility is guaranteed.

Additional information of issue #5 is following:
* Change the version from 0.8 to 0.8.1-SNAPSHOT because "version 0.8" means stable one.