Explicitly list out printable ASCII characters

[ianyong]

Changes:

• Remove the abbr HTML tag.
  • Explicitly list out all printable ASCII characters instead.
• Update constraints messages for Title and Category to be more informative.
• Add tests to ensure that only printable ASCII characters are allowed for Title and Category.

Addresses #131 (comment).

[codecov-io]

Codecov Report

Merging #257 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #257   +/-   ##
=========================================
  Coverage     71.58%   71.58%           
  Complexity      897      897           
=========================================
  Files           141      141           
  Lines          2819     2819           
  Branches        330      330           
=========================================
  Hits           2018     2018           
  Misses          682      682           
  Partials        119      119           

Impacted Files	Coverage Δ	Complexity Δ
..._cs2103_w16_3/finesse/model/category/Category.java	81.81% <ø> (ø)	6.00 <0.00> (ø)
..._cs2103_w16_3/finesse/model/transaction/Title.java	90.90% <ø> (ø)	8.00 <0.00> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a22d7ea...0e3c7b9. Read the comment docs.

[wltan]

LGTM, however do note that the issue is currently autolinked to close #131, which might not be intended.

[yongping827]

LGTM

[wltan]

LGTM!

[siddarth2824]

LGTM!