V1.4.0 - Fix email and matriculation regex

[marcustw]

Fix email and matriculation regex, fix documentation bugs

[codecov-io]

Codecov Report

Merging #211 into master will increase coverage by 0.00%.
The diff coverage is 88.88%.

@@            Coverage Diff            @@
##             master     #211   +/-   ##
=========================================
  Coverage     74.85%   74.86%           
- Complexity      934      935    +1     
=========================================
  Files           132      132           
  Lines          2760     2761    +1     
  Branches        279      278    -1     
=========================================
+ Hits           2066     2067    +1     
  Misses          604      604           
  Partials         90       90           

Impacted Files	Coverage Δ	Complexity Δ
.../logic/commands/studentlist/AddStudentCommand.java	100.00% <ø> (ø)	8.00 <0.00> (ø)
src/main/java/atas/model/student/Email.java	80.00% <ø> (ø)	6.00 <0.00> (ø)
src/main/java/atas/logic/parser/AtasParser.java	86.79% <88.57%> (+0.25%)	24.00 <18.00> (+1.00)
...rc/main/java/atas/model/student/Matriculation.java	80.00% <100.00%> (ø)	6.00 <0.00> (ø)

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[nweiyue]

LGTM!