Update tests to include country and timezone

[tankangliang]

Description

client edit is now working with timezone and country fields. Tests have been updated to include changes in country and timezone. Tests are also added for Timezone.

Fixes #78 #81 #84

Testing

Initial state of application:
client add n/Name1 e/email@gmail.com p/911 a/Address c/SG tz/GMT-12
client add n/Name2 e/email2@gmail.com p/922 a/Address c/SG tz/GMT+12

Commands ran in order:

1. client edit 1 c/MY -> Client "Name1" now has country Malaysia
2. client edit 2 c/JP -> Client "Name2" now has country Japan
3. client edit 1 tz/GMT+5 Client "Name1" now has country Msia and timezone GMT+5
4. client edit 2 tz/GMT-5 Client "Name2" now has country Japan and timezone GMT-5

Remarks

nil

[codecov-io]

Codecov Report

Merging #139 into master will increase coverage by 0.42%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #139      +/-   ##
============================================
+ Coverage     70.99%   71.41%   +0.42%     
- Complexity      519      523       +4     
============================================
  Files            90       90              
  Lines          1665     1665              
  Branches        171      171              
============================================
+ Hits           1182     1189       +7     
+ Misses          421      418       -3     
+ Partials         62       58       -4     

Impacted Files	Coverage Δ	Complexity Δ
...eedu/address/logic/commands/ClientEditCommand.java	94.93% <100.00%> (ø)	12.00 <0.00> (ø)
.../seedu/address/logic/parser/AddressBookParser.java	51.02% <100.00%> (ø)	14.00 <0.00> (ø)
...ddress/logic/parser/ClientDeleteCommandParser.java	100.00% <100.00%> (ø)	2.00 <1.00> (?)
.../address/logic/parser/ClientFindCommandParser.java	100.00% <100.00%> (ø)	3.00 <1.00> (?)
...in/java/seedu/address/logic/parser/ParserUtil.java	94.11% <0.00%> (+3.92%)	19.00% <0.00%> (+1.00%)
...main/java/seedu/address/model/client/Timezone.java	86.36% <0.00%> (+22.72%)	10.00% <0.00%> (+3.00%)

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[raysonkoh]

LGTM