Improved performance of compile_list

Compile list now uses a more reader-friendly version the taxon table
(pollen.equiv.RData, also added, with help page) and returns a full
pollen object, just like the one returned by get_download.  It's also a
bit faster since it doesn't need to pull down data from the API, using
only data stored in the pollen object.
Merge pull request #40 from SimonGoring/master

Improved performance of compile_list
Added files to collate list in DESCRIPTION

I'm pretty sure I'll get this right eventually.
Merge pull request #41 from SimonGoring/master

Added files to collate list in DESCRIPTION
Revised the translation tables and compile list.

Some other minor changes.  Mostly I updated the translation table to
make it easier to simplify taxonomies to accepted standards.
Merge pull request #42 from SimonGoring/master

Revised the translation tables and compile list.
get_download can now fetch multiple sites.

I've modified the code of get_download to allow it to call multiple
sites at once and return tem in a list of sites.
Added flags for cf and types in the compile_list, no implementation yet though.
Identify unique and non-unique taxa, aggregate by summing and return warnings if non-unique taxa appear in a single sample.
merged conflict from simons old and new branches for get_download
Rebuilding changed the compile_list .Rd file (left over from commit 52d20c8da)
Merge pull request #45 from SimonGoring/master

Rebuilding changed the compile_list .Rd file (left over from commit 52d2...
Added the warning message for lab objects. Improved comments.
Merge pull request #46 from SimonGoring/master

Added the warning message for lab objects. Improved comments.
Improved get_download help, changed example and roxygenized.
Merge pull request #47 from SimonGoring/master

Improved get_download help, changed example and roxygenized.
Both pollen objects and matrices/data.frames work now. Fixed help & cleaned code.
Merge pull request #48 from SimonGoring/master

Both pollen objects and matrices/data.frames work now. Fixed help & clea...
Added the changes for cf and type flags.
Merge pull request #49 from SimonGoring/master

Added the changes for cf and type flags.