gitignore
fixing files still
git ignore change
incremented version to 0.5.2

Added corpus method for tm VCorpus;
Added a zipfiles() function to unzip files and return a directory for import using corpus.directory();
Incremented to 0.5.3, see NOTES.
Added lexical diversity.
Some fixes and tweaks to corpus functions, see NOTES quanteda 0.5....
some tests with Russian texts, performance implications are interesting.
Merge branch 'dev' of https://github.com/kbenoit/quanteda into dev
enc in corpus methods now actually converts from enc to "UTF-8".
Merge branch 'dev' of https://github.com/kbenoit/quanteda into dev
Minor tweaks: clean, metadoc, summary.corpus
Minor bug fixes to summary.corpus, metadoc.
Merge branch 'dev' of https://github.com/kbenoit/quanteda into dev
Changed Requires to R 3.0 only.
profiling code
Merge branch 'dev' of https://github.com/kbenoit/quanteda into dev
added documentation for clean twitter option.
Added a `+.corpus` method.
Fast collocation method: collocations2.
Fixed broken stat computation in collocations, updated manual, and replaced collocations with the working titled collocations2.  Now there is only one collocations and it works, works correctly, and works FAST.