added pre-load functioanlity to data source, transmue.chainsolve now 200x faster.
made using temperature as part of the data source key optional.
rm'd temp flag from NullDataSource
more flags for not using temperature on data sources
partway through chainsolve decay refactor when a bug in fundemendal data was found.
ensdf reader update to grab approximate rates
reverted change.  This needs more thought.
more tansmute meanderings
fixed up docs to use new breathe
Merge pull request #174 from cbrachem/staging

Updated MCNP homepage URL.
Merge pull request #173 from scopatz/enquicken

added pre-load functioanlity to data source, transmue.chainsolve now 200x faster
Merge branch 'staging' of github.com:pyne/pyne into staging
Couldn't figure out @gonuke's des=0.0 trick in 2 hrs.  This'll have to wait for v0.4
adds some lines to the installation instructions in order to keep folks from seeing issue #177
made the instructions slightly more clear.
needed quotes
review responses`
Merge pull request #179 from katyhuff/mac_env

Mac env installation instructions
moved many files.
updated docs to build