Add some parameter type checking for prepared statements

[kevinmartin]

Whenever I use anything besides Types.DECIMAL for number type, I get Error: Incorrect arguments to mysqld_stmt_execute.

Related to: #348

[sidorares]

typo here s/paramerer/parameters/

[sidorares]

Thanks @kevinmartin !
Could you add a test ( with execute + number + string + array + date parameters ) ?

[kevinmartin]

Any guidance?

[sidorares]

Unfortunately mysql server version on TravisCI does not support json ( maybe this can be overriden, but right now .travis.yml uses default setup ). Maybe you add simple select with parameters, using at least numeric and string parameter types
Test examples:
https://github.com/sidorares/node-mysql2/blob/master/test/integration/connection/test-execute-newdecimal.js
https://github.com/sidorares/node-mysql2/blob/master/test/integration/connection/test-execute-null-bitmap.js
https://github.com/sidorares/node-mysql2/blob/master/test/integration/connection/test-execute-signed.js

Actually it looks like it's already covered ( with exception for JSON case ) Maybe you add your original JSON test, but wrap it with a sql check to execute only when JSON type supported?