Add UO SRML data reader (#594)

* read_srml function

* testing and style fixes

* some code and document clarification changes

* use subset of data file for example/testing

* fix filename and style

* update tests to use parameters compatible with 2.7-min testing environment

* remove 0.# suffixes from flag columns in included data file

* clarify time parsing code

* update what's new

* Style updates, capitalize module scope variable, parse year inside format_index

Author: lboeman

docs/sphinx/source/api.rst

@@ -307,6 +307,8 @@ relevant to solar energy modeling.
 
    iotools.read_tmy2
    iotools.read_tmy3
+   iotools.read_srml
+   iotools.read_srml_month_from_solardat
 
 A :py:class:`~pvlib.location.Location` object may be created from metadata
 in some files.

docs/sphinx/source/whatsnew/v0.6.1.rst

@@ -20,7 +20,8 @@ API Changes
 
 Enhancements
 ~~~~~~~~~~~~
-
+* Created :py:func:`pvlib.iotools.read_srml` and :py:func:`pvlib.iotools.read_srml_month_from_solardat`
+  to read University of Oregon Solar Radiation Monitoring Laboratory data. (:issue:`589`)
 
 Bug fixes
 ~~~~~~~~~
@@ -33,4 +34,5 @@ Testing
 
 Contributors
 ~~~~~~~~~~~~
-* Will Holmgren (:ghuser:`wholmgren`)
+* Will Holmgren (:ghuser:`wholmgren`)
+* Leland Boeman (:ghuser:`lboeman`)