Add support for Serializable fields

[sami-b95]

This slight addition allows to store into database any object field type implementing the Serializable interface in addition to the Java types already supported. For instance, (small) lists or maps of Serializable types can now be stored into database without creating additional models or writing boilerplate serialization/deserialization code to/from BLOB.

[mention-bot]

@sami-b95, thanks for your PR! By analyzing the annotation information on this pull request, we identified @JonatanSalas, @sibelius and @whoshuu to be potential reviewers

[JonatanSalas]

@sami-b95 would you like to check why the tests are breaking? If you fix this and the build pass I will check the code a little bit, and then I will merge to the master.

[sami-b95]

Thanks for your response @JonatanSalas. I have amended the code so as to pass all the tests except one (defined in class com.orm.helper.NamingHelperTest). The reason is this test indirectly calls ContextUtils.getPackageManager(), but ContextUtils.ctx is null when it occurs, resulting in an NullPointerException. I have tried to execute the tests on my own machine, and I end up with the same error, not only on my forked branch but also on the current master branch. Any idea what the issue may be ?

[JonatanSalas]

@sami-b95 The ctx needs to be setted, because sugarORM relies on it. If I can, I will try to take a look at it to fix the test cases that are broken.

[sibelius]

@sami-b95 try to rebase ur commits with master

maybe this commit could help: e93b2f1

by @Vookash