Correct grammar and interface for parser
Merge branch 'feature/server-test#types' of https://github.com/ilucin/relsem-bridge-backend into parser
Merge pull request #4 from ilucin/feature/server-test#methods

Methods for sending Row Description and Data Row working.
Merge pull request #6 from ilucin/parser

Parser
Code maintenance: removed unused variables, fixed indentation, fixed
imports, add comments etc. etc.
Added an helper class to send message and to encapsulate the
"NullterminateString" function. Added some Javadocs.
Updated client with simple menu
Parser added
Parser connected, error on tokens.
A better handling of exceptions
Avoid stupid crashes of the client.
Example interface for the parser (needs to be completed)
Added a method to send an error message to the client. Added Javadocs
FIX: sendCommandCompleteMessage method
FIX: now the server perfectly receive the query from the client
Connected DBMS, fails on parser. Needs interface
Parser integration #1 test
selection clauses and expressions
moved negation from expressions to clauses
init queryExec, moved init,offset,label to properties class