updates for API changes; add long-waited features;

• add vulnerability field for product details #6
• BREAKING - refactored the veye info command, which expect that a product language is explicitly specified with --language flag and allows,
  new command looks like this now bundle exec bin/veye info --language=PHP --version='3.0.1' symfony/symfony --format=table
• BREAKING - renamed the products command to package
• BREAKING - moved info command under the package command
• BREAKING - refactored others subcommands of the package to match with the info command.
• BREAKING - project commands accept --all as flag, but not attribute with value
• add --private flag for the project check command, possible to mark project visibility when checking project file #25
• add --temp flag for the the project check command, possible to create temporary projects;
• add --all, --major, --minor, --patch flag for all the projects command, including the check command; those flags allow filter outdated dependencies by SemVer scopes; #23
• project dependencies are now sorted by upgrade_complexity_heuristics, which heuristic metric that gives an rough estimation how difficult upgrading to a current version will be;
• all the output of project commands include now the upgrade_complexity_heuristics
• add merge and unmerge subcommands under the projects command, which allows to attach child project to the parent_project. #30