rename to isolated_server

we'll have something cuter later.
extract mysql-specific code to a subclass
fix .down! hang
install rspec
initial mysql integration test
add mysql make_slave_of specs
move common initialize param setting to Base
remove unused variables

warnings raised:

isolated_server/lib/isolated_server/base.rb:47: warning: assigned but unused variable - e
isolated_server/lib/isolated_server/base.rb:86: warning: assigned but unused variable - e
isolated_server/lib/isolated_server/mysql.rb:44: warning: shadowing outer local variable - pipe
isolated_server/lib/isolated_server/mysql.rb:44: warning: assigned but unused variable - pipe
refactor and escape executoins
more shell escaping
Merge pull request #1 from gabetax/mysql_extraction

Generalization and extracting MySQL