Feature request: Automate process of installing new bower item

[shawnlonas]

From : #5 (comment)

What we need also that is after locking the file to write pre install script to be executed before installing new packages, so that it'll automate the process of:

unlock bower file.
continue the installation of the new package.
lock the bower file again.

[AbdoDabbas]

I think the steps to implement it will be like this:

1. Check if .bowerrc file exists.
2. Read it if exists and create if not.
3. add scripts property or use the exists one.
4. in preinstall and preuninstall add bower-locker unlock command.
5. in postinstall and postuninstall add bower-locker lock command.
6. make sure in 4, 5 to check if there's already commands written (and this will be tricky a little bit).