Add some javadocs about best practices for migrations and error handling
Add some javadocs about best practices for migrations and error handling

yahoo/squidb,jdkoren/squidb,jdkoren/squidb,sbosley/squidb,yahoo/squidb,jdkoren/squidb,sbosley/squidb,yahoo/squidb,sbosley/squidb,yahoo/squidb,jdkoren/squidb,yahoo/squidb,sbosley/squidb,sbosley/squidb