Fixed strange behavior of TypesafeConfigReader trait.

Typesafeconfig trait was using TypesafeConfigReader object in #readJDBCSettings and #readConnectionPoolSettings. Because of this, TypesafeConfigReader#readJDBCSettings and #readConnectionPoolSettings couldn't load files other than application.conf.
Fixed test
Tried .sbtrc
Tried .sbtrc
Removed .sbtrc due to OOMError on BuildHive
Changed TypesafeConfigReader#readJDBCSettings to accept null user and password.
s/private/private[this]
Fixed dbconsole ignores an argument.

'if [ "$1" != "" ];' was always true because of 'shift' above.
Added show method
Added default tableName implementation
Prevented query exection errors for dbconsole
Removed workaround and added execute method
Added warn logging
Fixed tests for concurrency
version 1.4.8
Fixed #101 ResultSQLProvider which uses an external SQLSyntax value
Merge branch 'feature/result-with-syntax' into develop

Conflicts:
	scalikejdbc-interpolation/src/test/scala/scalikejdbc/SQLInterpolationSpec.scala