Change sed command by shelljs sed function in order to work w/ all platform

- Also remove search_replace template as it is now unuses
- dBReplace() function now return shell and not cmd anymore.
    Unit test will change as shell.sed returns the new string after replacement
    (But I'm not at ease w/ unit testing so I'll let this part to another).
Remove backslashes from dbDump cmd in order to work on windows platform

- I don't know if it still work on other platforms