Added relative tolerance to cropping
Merge branch 'master' of github.com:nilearn/nilearn into cropping
refactored threshold passing evaluation to use less memory
Inlined threshold checking
Add a news for frontiers paper.
Adress comments
Merge pull request #171 from AlexandreAbraham/frontiers_news

Add a news for frontiers paper.
changed rtol to 1e-8 and saved some memory by avoiding np.abs
Merge pull request #168 from eickenberg/cropping

Added relative tolerance to cropping
DOC: misc wording website
ENH: non-zero default memory_level

So that if you specific a 'memory' you immediately get memoization.
DOC: avoid side effects in examples
Merge branch 'master' of github.com:nilearn/nilearn