Add unit tests for api-tools/parser/sectionParser and api-tools/parser/courseParser #43

[SoggyRhino]

Test data is stored in parser/testdata. The idea is that there each parser will using the input.html and compare to proffessor.json/course.json, etc. I only have 5 test but I've only really worked on parseSection.

testdata
    ├───case_001
    │       course.json
    │       input.html
    │       section.json
    │
    ├───case_002
    │       course.json
    │       input.html
    │       section.json
    │

test_helpers_test.go

• simple loader for the test data

type TestData struct {
	RowInfo   map[string]*goquery.Selection
	ClassInfo map[string]string
	Section   schema.Section
	Course    schema.Course
}

parser.go

• moved all the parsing into sectionParser
• moved rowInfo and classInfo into functions so that it was easier to test other functions that needed them as input

sectionParser.go

• Since parseSection() didn't return anything I just made functions for all of the fields and tested them individually

courseParser.go

• Since all of the fields of each course are basically just classInfo["key"], so I didn't make individual functions
• getSection() now handles the parsing
• parseSection() is more like get or load

[jpahm]

Completes #43. Will review soon.