docs for mybatis
Merge branch 'm1.mybatis' into m2.entitylifecycle

Conflicts:
	src/main/java/org/javatalks/training/hibernate/mybatisdao/mapper/BookMapper.java
Merge branch 'm2.entitylifecycle' into m2.ids
Merge branch 'm2.ids' into m3.associations.components
Merge branch 'm3.associations.components' into m3.associations.oto
Merge branch 'm3.associations.oto' into m3.associations.collections
Merge branch 'm3.associations.collections' into m4.fetching