trying secondary database
implemented keyindexable
temp save:still havent got the duplicate record works.
updated the iterator, temp save
temp save, will change the structure, not to return a cursor
passed all the nontransactional case
after huge refactoring
except the mutilthread
all passed, but need more test for the multithread read and write
now the secondary database is reloadable; before cleaning code and adding log
added logging
pre-0.3.0
0.3
Merge branch 'dev3d'
Merge branch 'master' of https://github.com/Zekai/EulerDB

Conflicts:
	README.md