Merge pull request #77 from hieuk09/test_employee_bank_detail

Write test EmployeeBankDetail

[Closes #76]
Merge pull request #91 from hieuk09/test_finance_fee_structure_element

Write test FinanceFeeStructureElement

[Closes #72]
Refactor finance_controller
Update CodeClimate badge
Fix 2 pending, covered test model Subject
[Closes #9]
Fix SQLI #overlap_condition
[Closes #64]
Add Guardian test model
[Closes #71]
Add EmployeeGrade test model
[Closes #83]
Add test StudentCategory
[Closes #84]
Add test FinanceFeeCategory model
[Closes #69]
Fix failed test for Guardian model
Add FinanceFeeParticular test model

[Closes #85]
Add FinanceFee test model
[Closes #86]
Covered all method test GradingLevel
[Closes #87]
Covered all method EmployeeDepartment
[Closes #88]
Add News test model
[Closes #90]
Add CceWeightage test model
[Closes #89]
Write test FinanceDonation
[Closes #92]
Write test StudentFeeCollectionDiscount
[Closes #93]
Write test CceGradeSet
[Closes #96]