Track velocity norms as dynamic proxies in Axial stretching and Timoshenko examples

[tp5uiuc]

Adds functionality to track velocity of the rod to check if the simulation is close to reaching the quasi-steady state.

Apologies for adding a new branch to the main repo, I was in a hurry.

[codecov-commenter]

Codecov Report

Merging #97 (dfa9869) into update-0.3.0 (5f15801) will increase coverage by 87.06%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##           update-0.3.0      #97       +/-   ##
=================================================
+ Coverage              0   87.06%   +87.06%     
=================================================
  Files                 0       41       +41     
  Lines                 0     2535     +2535     
  Branches              0      344      +344     
=================================================
+ Hits                  0     2207     +2207     
- Misses                0      306      +306     
- Partials              0       22       +22     

Impacted Files	Coverage Δ
elastica/wrappers/__init__.py	100.00% <0.00%> (ø)
elastica/wrappers/memory_block.py	100.00% <0.00%> (ø)
elastica/version.py	0.00% <0.00%> (ø)
elastica/external_forces.py	95.18% <0.00%> (ø)
elastica/rigidbody/data_structures.py	44.82% <0.00%> (ø)
elastica/_linalg.py	95.65% <0.00%> (ø)
elastica/wrappers/connections.py	93.44% <0.00%> (ø)
elastica/rod/knot_theory.py	97.97% <0.00%> (ø)
elastica/utils.py	98.00% <0.00%> (ø)
elastica/timestepper/__init__.py	100.00% <0.00%> (ø)
... and 31 more

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[bhosale2]

One minor change.

[armantekinalp]

LGTM

[bhosale2]

LGTM.