Allometry: added allom.components table as data object to assist user in setting component IDs in function calls.
Allometry:
- modified allow.BayesFit to return example data
- modified AllomAve to include an x-y figure with the example data and the two fit lines
- More general improvements to documentation, including a working example in AllomAve
Merge branch 'master' of https://github.com/PecanProject/pecan
Merge pull request #90 from mdietze/master

Allometry: additional diagnostic plots, documentation. added data(allom.components) so users can look up the component ID's they need to run