Update TODO list

* Reflect Pierrick's current activity
* Add benchmarking idea
Rework core::file::readline implementation

* Avoid useless redundancy between core::file::readline() and
  core::file::readline(size_t)
* Fix a bug due to using size_t instead of ssize_t
* Fix performance issue by using a thread-safe static storage
* Fix string interface usage
Fix performance and conformance issue in string to long conversion

* std::stringstream proved to be very slow (additional copy?), using
  strtol instead is *really** faster
* raise an exception if conversion failed
* test the whole stuff
Fix memory leak in last implementation of file.readline()
Merge pull request #62 from artas360/master

Fix memory leak in last implementation of file.readline()
Make the ``in'' intrinsic compatible with generators

No const reference because iterating over a generator modifies the
generator.
Fix tuple unpacking in generator

When unpacking a tuple, a local variable is created, but it should be
made a member as other variables when in a generator, or bad things
happen.

This commit clauses #60.
Merge branch 'master' of github.com:serge-sans-paille/pythran
Fix bug in aliasing handling in except handler

Forward the visitor properly, closes #63.