removed .rake_tasks~
ignore gem files in root
unify spaces
typo: allready => already
Merge pull request #59 from krautcomputing/fix_allready_typo

Fix typo
Merge pull request #58 from toy/cleanup-0.3

* Fixed typos
* Removed .rake_tasks~ file
* Ignore .gem files in project root
* Whitespace and indentation treatment
Add constant SDoc::VERSION to specify current version of SDoc gem
Keep just one source for version