Change implements of individual apps.
Move individual app packages.
Add null check.
Add empty test.
Update Unsubscribe class
Release version 0.9.2
Change versiont to 0.9.3-SNAPSHOT
change .gitignore
Resolve conflict for 'w092'

Conflicts:
	src/main/java/jp/co/flect/sendgrid/SendGridClient.java
	src/test/java/jp/co/flect/sendgrid/AppTest.java
Implement Dkim, Footer GoogleAnalytics, SpamCheck
Merge branch 'master' of https://github.com/shunjikonishi/sendgrid4j