- Test for construction of sequence from initializer_list added.
- .gitignore defined
- Eclipse project files added to repository
InitializerListSeq stores data in own std::vector in order to avoid
issues due to the unspecified lifetime of std::initializer_list.
TODO file added
- Documentation added which methods must be overridden by subclasses
  of Sequence
Polishing of test code:
- Use shorter forms of writeTo command
- Systematically check support for conversion of sequences to bool
- Improve naming