Several Improvements

• Methods for working with companies (create, list, update, delete)
• Several Fixes and Improvements

Contributors
@maxkoryukov

Initial Release

• createTicket(ticket, callback) - Create a new ticket, list of parameters
• getTicket(id, callback) - Get a ticket by its id
• updateTicket(id, ticket, callback) - Update a ticket by its id, list of parameters
• deleteTicket(id, callback) - Delete a ticket by its id
• restoreTicket(id, callback) - Restore a ticket by its id
• listAllTickets(filter, callback) - List All Tickets, check list of filters
• listAllTicketFields(callback) - List All Ticket Fields
• listAllConversations(id, callback) - List All Conversations of a Ticket by its id
• listAllTimeEntries(id, callback) - List All Time Entries of a Ticket by its id