Continued progress on CrowdSource_File

basic_utils:
- getLineWith more accurately named getFirstLineWith

_File:
- new method parseLineAndSetAttr(). Given the proper variables, will
read to a specific line, parse file header information, and set the
variable in the _File class
- added some explanatory comments around the parsing of the date and
time

FieldTest_File:
- small fixes to top documentation and imports
- replaced old header information parsing with new method inherited
from _File (parseLineAndSetAttr)

CrowdSource_File:
- updated top documentation
- working on finishing header information imports