Refactor packages

[erisjacey]

./src/main/java:

• seedu.address -> atas

• seedu.address.logic.commands.atascommands
  -> atas.logic.commands.atas

• seedu.address.logic.commands.confirmationcommands
  -> atas.logic.commands.confirmation

• seedu.address.logic.commands.sessionlistcommands
  -> atas.logic.commands.sessionlist

• seedu.address.logic.commands.sessioncommands
  -> atas.logic.commands.sessionlist.session

• seedu.address.logic.commands.studentlistcommands
  -> atas.logic.commands.studentlist

./src/test/java:

• seedu.address -> atas

Refactor each Java test file in seedu.address.logic.commands into their own relevant package

• atas
• confirmation
• sessionlist
• sessionlist.session
• studentlist

[codecov-io]

Codecov Report

Merging #96 into master will increase coverage by 0.29%.
The diff coverage is 78.37%.

@@             Coverage Diff              @@
##             master      #96      +/-   ##
============================================
+ Coverage     70.86%   71.15%   +0.29%     
+ Complexity      651      650       -1     
============================================
  Files           109      109              
  Lines          2073     2063      -10     
  Branches        226      224       -2     
============================================
- Hits           1469     1468       -1     
+ Misses          537      528       -9     
  Partials         67       67              

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/atas/Main.java	0.00% <ø> (ø)	0.00 <0.00> (?)
src/main/java/atas/MainApp.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
src/main/java/atas/commons/core/Config.java	68.18% <ø> (ø)	7.00 <0.00> (?)
src/main/java/atas/commons/core/GuiSettings.java	69.23% <ø> (ø)	5.00 <0.00> (?)
src/main/java/atas/commons/core/LogsCenter.java	78.37% <ø> (ø)	10.00 <0.00> (?)
src/main/java/atas/commons/core/Messages.java	75.00% <ø> (ø)	2.00 <0.00> (?)
src/main/java/atas/commons/core/Version.java	82.50% <ø> (ø)	19.00 <0.00> (?)
src/main/java/atas/commons/core/index/Index.java	75.00% <ø> (ø)	11.00 <0.00> (?)
...as/commons/exceptions/DataConversionException.java	100.00% <ø> (ø)	1.00 <0.00> (?)
...atas/commons/exceptions/IllegalValueException.java	100.00% <ø> (ø)	2.00 <0.00> (?)
... and 100 more

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[nweiyue]

LGTM